From patchwork Thu Sep 30 20:00:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535028 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=ZMUBFg1U; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL3zk71h0z9s0r for ; Fri, 1 Oct 2021 06:01:54 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id A111E3858001 for ; Thu, 30 Sep 2021 20:01:52 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A111E3858001 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032112; bh=bTUgubhVK24kZGDDY9aqih+rj2HsuYn1T7kCpFIWOWw=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=ZMUBFg1UPy4bzE2PRs3h7D0DCTfBMDvcB4ORaxPKst45tbsPyiHZtTDKOCtCn8qYy tVpg6EyEp4TsrW3kYXwx+GZn8RWPNvfu/h5BWE2lGb/Iq/2UixkmqQrlyDK2KuXNOm 1Vo/m3Gfp5syuUdwMQN9Qxy7AVOCNbi459MTmVMw= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x833.google.com (mail-qt1-x833.google.com [IPv6:2607:f8b0:4864:20::833]) by sourceware.org (Postfix) with ESMTPS id 2B1843858C2C for ; Thu, 30 Sep 2021 20:00:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 2B1843858C2C Received: by mail-qt1-x833.google.com with SMTP id b16so6883052qtt.7 for ; Thu, 30 Sep 2021 13:00:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=bTUgubhVK24kZGDDY9aqih+rj2HsuYn1T7kCpFIWOWw=; b=HlkwFkIfyYLwSRejrVsC2r0IUlYrW4n/tHaU72U+TRHTyIDlmn6O64ZYDQ7EBG21XL rPEC7DGDsFevzxr255N7P33wd12HQiop1obOK1nGsSAFtsGVaZVk3u5+BrQzMvRsablJ pd8ZfPU89PT121BtXjPxSyBDcbUJ+2sa4kPsYgtp1lVGBt/7iZcZrODqJoM1IZt0rdhU eO9jF1++8LHpXYtqe4GHw5A7jk4TB1sS7CzfPFLKNyOHwUUXRSjeUkQLfjPow8+GMT/H NlDpTcVzVlAFZ9r89LSGKeRt/+JYikCsb1Qq5pMqRWaaAaUyje1Srd+TJxpMiJeeIQnp nJWA== X-Gm-Message-State: AOAM53136l9HgNROMsY9306LF6wqX3GFnnZwI4Z1j/4gZf3wr/4naJ0m KpkmCn4Anq5GYliMquCoEzI7KoGwp0/qDw== X-Google-Smtp-Source: ABdhPJy8KmGRfPLp2+v2AhGE7pT6plzoiyZspvoKI/pNDo8yVZKREe2MB1v20CA4FWPU9kRiLeFA9w== X-Received: by 2002:ac8:538a:: with SMTP id x10mr8523009qtp.251.1633032057419; Thu, 30 Sep 2021 13:00:57 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.00.55 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:00:55 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 01/15] nptl: Set cancellation type and state on pthread_exit (BZ #28267) Date: Thu, 30 Sep 2021 17:00:37 -0300 Message-Id: <20210930200051.1017457-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" It is required by POSIX XSH 2.9.5 Thread Cancellation under the heading Thread Cancellation Cleanup Handlers. Checked x86_64-linux-gnu. --- nptl/Makefile | 3 +- nptl/cancellation.c | 7 ++- nptl/pthread_cancel.c | 1 - nptl/pthread_exit.c | 4 +- nptl/pthread_testcancel.c | 1 - nptl/tst-cleanup5.c | 129 ++++++++++++++++++++++++++++++++++++++ sysdeps/nptl/pthreadP.h | 18 ++++-- 7 files changed, 152 insertions(+), 11 deletions(-) create mode 100644 nptl/tst-cleanup5.c diff --git a/nptl/Makefile b/nptl/Makefile index ff4d590f11..e1e195cc15 100644 --- a/nptl/Makefile +++ b/nptl/Makefile @@ -306,7 +306,8 @@ tests = tst-attr2 tst-attr3 tst-default-attr \ tst-pthread-gdb-attach tst-pthread-gdb-attach-static \ tst-pthread_exit-nothreads \ tst-pthread_exit-nothreads-static \ - tst-thread-setspecific + tst-thread-setspecific \ + tst-cleanup5 tests-nolibpthread = \ tst-pthread_exit-nothreads \ diff --git a/nptl/cancellation.c b/nptl/cancellation.c index 44f8417845..7cef9487bf 100644 --- a/nptl/cancellation.c +++ b/nptl/cancellation.c @@ -41,7 +41,6 @@ __pthread_enable_asynccancel (void) && !(ch & EXITING_BITMASK) && !(ch & TERMINATED_BITMASK)) { - THREAD_SETMEM (self, result, PTHREAD_CANCELED); __do_cancel (); } @@ -63,3 +62,9 @@ __pthread_disable_asynccancel (int oldtype) self->canceltype = PTHREAD_CANCEL_DEFERRED; } libc_hidden_def (__pthread_disable_asynccancel) + +void +__do_cancel (void) +{ + __exit_thread (PTHREAD_CANCELED); +} diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c index a8aa3b3d15..868cf676a3 100644 --- a/nptl/pthread_cancel.c +++ b/nptl/pthread_cancel.c @@ -107,7 +107,6 @@ __pthread_cancel (pthread_t th) __libc_multiple_threads = 1; #endif - THREAD_SETMEM (pd, result, PTHREAD_CANCELED); if (pd->cancelstate == PTHREAD_CANCEL_ENABLE && pd->canceltype == PTHREAD_CANCEL_ASYNCHRONOUS) __do_cancel (); diff --git a/nptl/pthread_exit.c b/nptl/pthread_exit.c index f54388a8e2..14a73043bf 100644 --- a/nptl/pthread_exit.c +++ b/nptl/pthread_exit.c @@ -31,9 +31,7 @@ __pthread_exit (void *value) " must be installed for pthread_exit to work\n"); } - THREAD_SETMEM (THREAD_SELF, result, value); - - __do_cancel (); + __exit_thread (value); } libc_hidden_def (__pthread_exit) weak_alias (__pthread_exit, pthread_exit) diff --git a/nptl/pthread_testcancel.c b/nptl/pthread_testcancel.c index 7a7a199b6d..6c613462ab 100644 --- a/nptl/pthread_testcancel.c +++ b/nptl/pthread_testcancel.c @@ -29,7 +29,6 @@ ___pthread_testcancel (void) && !(cancelhandling & EXITING_BITMASK) && !(cancelhandling & TERMINATED_BITMASK)) { - THREAD_SETMEM (self, result, PTHREAD_CANCELED); __do_cancel (); } } diff --git a/nptl/tst-cleanup5.c b/nptl/tst-cleanup5.c new file mode 100644 index 0000000000..f1f81a40fe --- /dev/null +++ b/nptl/tst-cleanup5.c @@ -0,0 +1,129 @@ +/* Check if cancellation state and type is correctly set on thread exit. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include + +static int pipefds[2]; +static pthread_barrier_t b; + +static void +clh (void *arg) +{ + /* Although POSIX state setting either the cancellation state or type is + undefined during cleanup handler execution, both calls should be safe + since none has any side-effect (they should not change current state + neither trigger a pending cancellation). */ + + int state; + TEST_VERIFY (pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &state) == 0); + TEST_COMPARE (state, PTHREAD_CANCEL_DISABLE); + + int type; + TEST_VERIFY (pthread_setcanceltype (PTHREAD_CANCEL_DEFERRED, &type) == 0); + TEST_COMPARE (type, PTHREAD_CANCEL_DEFERRED); +} + +/* Check if a thread with PTHREAD_CANCEL_DEFERRED cancellation on + pthread_cleanup_pop sets the correct state and type as pthread_exit. */ +static void * +tf_cancel_deferred (void *arg) +{ + xpthread_barrier_wait (&b); + + pthread_cleanup_push (clh, NULL); + + char c; + read (pipefds[0], &c, 1); + + pthread_cleanup_pop (1); + + return NULL; +} + +/* Check if a thread with PTHREAD_CANCEL_DEFERRED cancellation on + blocked read() sets the correct state and type as pthread_exit. */ +static void * +tf_testcancel (void *arg) +{ + xpthread_barrier_wait (&b); + + pthread_cleanup_push (clh, NULL); + + char c; + read (pipefds[0], &c, 1); + + pthread_testcancel (); + + pthread_cleanup_pop (1); + + return NULL; +} + +#define EXIT_EXPECTED_VALUE ((void *) 42) + +/* Check if a thread with PTHREAD_CANCEL_DEFERRED cancellation on + pthread_exit() sets the correct state and type. */ +static void * +tf_exit (void *arg) +{ + xpthread_barrier_wait (&b); + + pthread_cleanup_push (clh, NULL); + + pthread_exit (EXIT_EXPECTED_VALUE); + + pthread_cleanup_pop (1); + + return NULL; +} + +static int +do_test (void) +{ + xpipe (pipefds); + + xpthread_barrier_init (&b, NULL, 2); + { + pthread_t th = xpthread_create (NULL, tf_cancel_deferred, NULL); + xpthread_barrier_wait (&b); + xpthread_cancel (th); + void *r = xpthread_join (th); + TEST_VERIFY (r == PTHREAD_CANCELED); + } + + { + pthread_t th = xpthread_create (NULL, tf_testcancel, NULL); + xpthread_barrier_wait (&b); + xpthread_cancel (th); + void *r = xpthread_join (th); + TEST_VERIFY (r == PTHREAD_CANCELED); + } + + { + pthread_t th = xpthread_create (NULL, tf_exit, NULL); + xpthread_barrier_wait (&b); + void *r = xpthread_join (th); + TEST_VERIFY (r == EXIT_EXPECTED_VALUE); + } + + return 0; +} + +#include diff --git a/sysdeps/nptl/pthreadP.h b/sysdeps/nptl/pthreadP.h index 0e39afecc6..aebddb361b 100644 --- a/sysdeps/nptl/pthreadP.h +++ b/sysdeps/nptl/pthreadP.h @@ -267,20 +267,30 @@ extern void __pthread_unregister_cancel (__pthread_unwind_buf_t *__buf) __cleanup_fct_attribute; libc_hidden_proto (__pthread_unregister_cancel) -/* Called when a thread reacts on a cancellation request. */ -static inline void -__attribute ((noreturn, always_inline)) -__do_cancel (void) +static _Noreturn inline void +__exit_thread (void *value) { struct pthread *self = THREAD_SELF; /* Make sure we get no more cancellations. */ THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT); + THREAD_SETMEM (self, result, value); + + /* It is required by POSIX XSH 2.9.5 Thread Cancellation under the heading + Thread Cancellation Cleanup Handlers and also avoid further cancellation + wrapper to act on cancellation. */ + THREAD_SETMEM (self, cancelstate, PTHREAD_CANCEL_DISABLE); + THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_DEFERRED); + __pthread_unwind ((__pthread_unwind_buf_t *) THREAD_GETMEM (self, cleanup_jmp_buf)); } +/* It is a wrapper over __exit_thread (PTHREAD_CANCELED). It is has its own + implementation because it might be called by arch-specific asm code. */ +_Noreturn void __do_cancel (void) attribute_hidden; + /* Internal prototypes. */ From patchwork Thu Sep 30 20:00:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535029 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=l6rWj0VV; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL40Y57bSz9s0r for ; Fri, 1 Oct 2021 06:02:37 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 272743857C73 for ; Thu, 30 Sep 2021 20:02:35 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 272743857C73 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032155; bh=hEmOLwFzs9CYBznEsiOpTfxj0Vk1yGyATmkja0uetZQ=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=l6rWj0VVT+sPkOIRfBlz6c/zLGazCQPXe8236gyUm7v2VpDbnjd3ZCR5QiJG8F7BC gqpB0IFiqj0Ub7zUuwZNtnLL6WjAu2uE/dnkCfkxGpQh3p/39zN7lN+tLrZmNGDwfL XyQ4qBLmDtjAJIWHNVDIcQJA04fR093iAd7rOdLE= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by sourceware.org (Postfix) with ESMTPS id 4B8E23857C42 for ; Thu, 30 Sep 2021 20:00:59 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4B8E23857C42 Received: by mail-qt1-x82b.google.com with SMTP id e16so6847172qte.13 for ; Thu, 30 Sep 2021 13:00:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=hEmOLwFzs9CYBznEsiOpTfxj0Vk1yGyATmkja0uetZQ=; b=CcxW29qBxMBR60Fce0i7XDN6NSbXja1PHwn3ZsuHKJvB7QLfKhjxv3lDDIe0O7Q2fE ReZKGqaSTMvrVuVE3DEMoED7gE+ADRDzPMFAZJgKC9B31ZfOsFs4AZHzyf/VPjbX4OJu V24gJu+wLG7GGaIHJovpmicIQ3u2yKqvBYT5xw2kDJYk1s8rlWh3zW6jouU3LRW2uMhj mQPp76cB+djU1jKgr8r55W+QHaTIGwg9V0VjidiioXkvoMW5KCAItdoaxo1SOz7VZRIo 9lAE37ypkkWsQMp6W/qMUaQl+bFwX841EuYVTL90AgiEz8yE4MtLXajQWctuXG3nDGJ3 0KiQ== X-Gm-Message-State: AOAM530RXOFiLKbEsPs9sxz4DyjqoTOsD9Q9oz0kIBJK7qF3M04lfCof VJsCkw2isWWsO16KxN4fruQY2yBK/y6NOA== X-Google-Smtp-Source: ABdhPJweqop7o2yiiK6h4G9XkPIYIlhCAjG4NZeOf8sX9gtM4pg55dWBK5KHC3qGefrWjgXE1BfsDg== X-Received: by 2002:a05:622a:283:: with SMTP id z3mr8603698qtw.324.1633032058589; Thu, 30 Sep 2021 13:00:58 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.00.57 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:00:58 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 02/15] nptl: Handle robust PI mutexes for !__ASSUME_SET_ROBUST_LIST (BZ #28268) Date: Thu, 30 Sep 2021 17:00:38 -0300 Message-Id: <20210930200051.1017457-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" The robust PI mutexes are signaled by setting the LSB bit to 1, so the code requires to take this consideration before access the __pthread_mutex_s. The code is also simplified: the initialization code is not really required, PD->robust_head.list and PD->robust_list.__next are essentially the same regardless of __PTHREAD_MUTEX_HAVE_PREV, the futex wake is optimized to be issued only when required, and the futex shared bit is set only when required. Checked on a build for m68k-linux-gnu. I also checked on x86_64-linux-gnu by removing the check for !__ASSUME_SET_ROBUST_LIST. --- nptl/pthread_create.c | 52 +++++++++++++++++++++---------------------- 1 file changed, 26 insertions(+), 26 deletions(-) diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index d6ea43a754..cd8401c878 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -507,35 +507,35 @@ start_thread (void *arg) __libc_lock_unlock (pd->exit_lock); #ifndef __ASSUME_SET_ROBUST_LIST - /* If this thread has any robust mutexes locked, handle them now. */ -# if __PTHREAD_MUTEX_HAVE_PREV - void *robust = pd->robust_head.list; -# else - __pthread_slist_t *robust = pd->robust_list.__next; -# endif - /* We let the kernel do the notification if it is able to do so. - If we have to do it here there for sure are no PI mutexes involved - since the kernel support for them is even more recent. */ - if (!__nptl_set_robust_list_avail - && __builtin_expect (robust != (void *) &pd->robust_head, 0)) + /* We let the kernel do the notification if it is able to do so on the exit + syscall. Otherwise we need to handle before the thread terminates. */ + void **robust; + while ((robust = pd->robust_head.list) + && robust != (void *) &pd->robust_head) { - do + /* Note: robust PI futexes are signaled by setting bit 0. */ + void **robustp = (void **) ((uintptr_t) robust & ~1UL); + + struct __pthread_mutex_s *mtx = (struct __pthread_mutex_s *) + ((char *) robustp - offsetof (struct __pthread_mutex_s, + __list.__next)); + int shared = mtx->__kind & 128; + + pd->robust_head.list_op_pending = robust; + pd->robust_head.list = *robustp; + /* Although the list will not be changed at this point, it follows the + expected kernel ABI. */ + __asm ("" ::: "memory"); + + int lock = atomic_exchange_relaxed (&mtx->__lock, FUTEX_OWNER_DIED); + /* Wake any users if mutex is acquired. */ + if (lock > 1) { - struct __pthread_mutex_s *this = (struct __pthread_mutex_s *) - ((char *) robust - offsetof (struct __pthread_mutex_s, - __list.__next)); - robust = *((void **) robust); - -# if __PTHREAD_MUTEX_HAVE_PREV - this->__list.__prev = NULL; -# endif - this->__list.__next = NULL; - - atomic_or (&this->__lock, FUTEX_OWNER_DIED); - futex_wake ((unsigned int *) &this->__lock, 1, - /* XYZ */ FUTEX_SHARED); + if ((uintptr_t) robust & 1) + futex_unlock_pi ((unsigned int *) &mtx->__lock, shared); + else + futex_wake ((unsigned int *) &mtx->__lock, 1, shared); } - while (robust != (void *) &pd->robust_head); } #endif From patchwork Thu Sep 30 20:00:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535031 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=CXJYj2qM; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL42H4BJPz9s0r for ; Fri, 1 Oct 2021 06:04:07 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 7CD2F3857C65 for ; Thu, 30 Sep 2021 20:04:05 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7CD2F3857C65 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032245; bh=D1ra2t5kopfyP5QQXA8XxkhsaTmtq8ku3VLRrr0Fnx4=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=CXJYj2qM6LewOeNy69B0yGgDhQpA2lch+4F2WAQavfP2ZWCVfc/awNgP/jr2ni1+a vCVgdnIMltLjKBQpSt3q1jQ0bAH5erkTq+fr5ESRCoEz5TTLLbsjZowo4tcV5KeKp2 Th+4r8tLYJgFKEKtZsbTwlQiZgiQnh1qbHrC3pdw= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x732.google.com (mail-qk1-x732.google.com [IPv6:2607:f8b0:4864:20::732]) by sourceware.org (Postfix) with ESMTPS id 3DF463857C62 for ; Thu, 30 Sep 2021 20:01:01 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 3DF463857C62 Received: by mail-qk1-x732.google.com with SMTP id i132so7082521qke.1 for ; Thu, 30 Sep 2021 13:01:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=D1ra2t5kopfyP5QQXA8XxkhsaTmtq8ku3VLRrr0Fnx4=; b=zu+g2yWa1wM6lJI+MyfQuZK6Qr4LYdnUWjwUP6RPfBp2PwyQr8rFggAZMHZ8gKdDr9 kA20grweKR+l4u2FECWZWY1rtBVk1Mpt4hXdexC0ePFrcCn1BgJe+evzAsLXqdV3hFZ7 R4dBg9g2vgHBY9mVtJilhX2uI+c0CHHWFQsJKbmy+3NtsoBXC7FkHNtYegb6aEvAxTAt 4WTwgE/rMtezaQ41E0rUEDwc2cdqzAmeRuROeqKW7tLWIlHZIIquR3WLIAy9mdG6Y/sq LsGm+7Fzz6qZdr8E74x4LhHo53cKHnWXZ6IfGrRFD0uSfVq8yQuy3umM5sJBqAqIboYw 5JHQ== X-Gm-Message-State: AOAM531IUeEuJ6rhcKbBjf5F9XpLvGlcu2o2U8yESDN8Nf454Sr0Py1d LAgkmDoyz3l7P22Nim/lVGQ/bxatq5yYcg== X-Google-Smtp-Source: ABdhPJxYPipFkmWf91RkzGwxQ0PBsJ+rvy4T8nvWmqTl38ieFWM0oa4NOQrMi3Ym8sPWnlhsF4xzRg== X-Received: by 2002:a37:9581:: with SMTP id x123mr6620127qkd.477.1633032059790; Thu, 30 Sep 2021 13:00:59 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.00.58 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:00:59 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 03/15] nptl: Do not use pthread set_tid_address as state synchronization (BZ #19951) Date: Thu, 30 Sep 2021 17:00:39 -0300 Message-Id: <20210930200051.1017457-4-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" The use after free described in BZ#19951 is due the use of two different PD fields, 'joinid' and 'cancelhandling', to describe the thread state to synchronize the calls of pthread_join(), pthread_detach(), pthread_exit(), and normal thread exit. And any state change potentially requires to check for both fields atomically to handle partial state (such as pthread_join() with a cancellation handler to issue a 'joinstate' field rollback). This patch uses a different PD member with 4 possible states (JOINABLE, DETACHED, EXITING, and EXITED) instead of pthread 'tid' field: 1. On pthread_create() the inital state is set either to JOINABLE or DETACHED depending of the pthread attribute used. 2. On pthread_detach(), a CAS is issued on the state. If the CAS fails it means that thread is already detached (DETACHED) or is being terminated (EXITING). For former an EINVAL is returned, while for latter pthread_detach() should be reponsible to join the thread (and deallocate any internal resources). 3. In the exit phase of the wrapper function for the thread start routine (reached either if the thread function has returned, pthread_exit() has being called, or cancellation handled has been acted upon) we issue a CAS on state to set to EXITING mode. If the thread is previously on DETACHED mode the thread itself is responsible for arranging the deallocation of any resource, otherwise the thread needs to be joined (detached threads cannot immediately deallocate themselves) 4. The clear_tid_field on 'clone' call is changed to set the new 'state' field on thread exit (EXITED). This state ins only reached at thread termination. 5. The pthread_join() implementation is now simpler: the futex wait is done directly on thread state and there is no need to reset it in case of timeout (since the state is now set either by pthread_detach() or by the kernel on process termination). The race condition on pthread_detach is avoided with only one atomic operation on PD state: once the mode is set to THREAD_STATE_DETACHED it is up to thread itself to deallocate its memory (done on the exit phase at pthread_create()). Also, the INVALID_NOT_TERMINATED_TD_P is removed since a a negative tid is not possible and the macro is not used anywhere. This change trigger an invalid C11 thread tests: it crates a thread, which detaches itself, and after a timeout the creating thread checks if the join fails. The issue is once thrd_join() is called the thread lifetime has already expired. The test is changed so the sleep is done by the thread itself, so the creating thread will try to join a valid thread. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64-linux-gnu. --- nptl/descr.h | 26 +++--- nptl/nptl-stack.h | 2 +- nptl/pthread_cancel.c | 3 +- nptl/pthread_clockjoin.c | 2 +- nptl/pthread_create.c | 47 +++++++--- nptl/pthread_detach.c | 40 ++++----- nptl/pthread_getattr_np.c | 2 +- nptl/pthread_join.c | 2 +- nptl/pthread_join_common.c | 130 ++++++++++------------------ nptl/pthread_timedjoin.c | 2 +- nptl/pthread_tryjoin.c | 18 ++-- sysdeps/nptl/dl-tls_init_tp.c | 4 +- sysdeps/nptl/libc_start_call_main.h | 7 ++ sysdeps/nptl/pthreadP.h | 3 +- sysdeps/pthread/tst-thrd-detach.c | 16 ++-- 15 files changed, 145 insertions(+), 159 deletions(-) diff --git a/nptl/descr.h b/nptl/descr.h index 41ee56feb2..76522b85b3 100644 --- a/nptl/descr.h +++ b/nptl/descr.h @@ -123,6 +123,18 @@ struct priority_protection_data }; +/* Define a possible thread state on 'joinstate' field. The value will be + cleared by the kernel when the thread terminates (CLONE_CHILD_CLEARTID), + so THREAD_STATE_EXITED must be 0. */ +enum + { + THREAD_STATE_EXITED = 0, + THREAD_STATE_EXITING, + THREAD_STATE_JOINABLE, + THREAD_STATE_DETACHED, + }; + + /* Thread descriptor data structure. */ struct pthread { @@ -165,8 +177,7 @@ struct pthread GL (dl_stack_user) list. */ list_t list; - /* Thread ID - which is also a 'is this thread descriptor (and - therefore stack) used' flag. */ + /* Thread ID set by the kernel with CLONE_PARENT_SETTID. */ pid_t tid; /* Ununsed. */ @@ -334,15 +345,8 @@ struct pthread hp_timing_t cpuclock_offset_ununsed; #endif - /* If the thread waits to join another one the ID of the latter is - stored here. - - In case a thread is detached this field contains a pointer of the - TCB if the thread itself. This is something which cannot happen - in normal operation. */ - struct pthread *joinid; - /* Check whether a thread is detached. */ -#define IS_DETACHED(pd) ((pd)->joinid == (pd)) + /* The current thread state defined by the THREAD_STATE_* enumeration. */ + unsigned int joinstate; /* The result of the thread function. */ void *result; diff --git a/nptl/nptl-stack.h b/nptl/nptl-stack.h index c0b8e48f70..f703ae449a 100644 --- a/nptl/nptl-stack.h +++ b/nptl/nptl-stack.h @@ -31,7 +31,7 @@ extern size_t __nptl_stack_cache_maxsize attribute_hidden; static inline bool __nptl_stack_in_use (struct pthread *pd) { - return pd->tid <= 0; + return atomic_load_relaxed (&pd->joinstate) == THREAD_STATE_EXITED; } /* Remove the stack ELEM from its list. */ diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c index 868cf676a3..d09947807e 100644 --- a/nptl/pthread_cancel.c +++ b/nptl/pthread_cancel.c @@ -61,7 +61,8 @@ __pthread_cancel (pthread_t th) { volatile struct pthread *pd = (volatile struct pthread *) th; - if (pd->tid == 0) + int state = atomic_load_acquire (&pd->joinstate); + if (state == THREAD_STATE_EXITED || state == THREAD_STATE_EXITING) /* The thread has already exited on the kernel side. Its outcome (regular exit, other cancelation) has already been determined. */ diff --git a/nptl/pthread_clockjoin.c b/nptl/pthread_clockjoin.c index 2d01ba03a2..76598ff0fa 100644 --- a/nptl/pthread_clockjoin.c +++ b/nptl/pthread_clockjoin.c @@ -30,7 +30,7 @@ ___pthread_clockjoin_np64 (pthread_t threadid, void **thread_return, return EINVAL; return __pthread_clockjoin_ex (threadid, thread_return, - clockid, abstime, true); + clockid, abstime); } #if __TIMESIZE == 64 diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index cd8401c878..c7d53edbb8 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -286,7 +286,7 @@ static int create_thread (struct pthread *pd, const struct pthread_attr *attr, .flags = clone_flags, .pidfd = (uintptr_t) &pd->tid, .parent_tid = (uintptr_t) &pd->tid, - .child_tid = (uintptr_t) &pd->tid, + .child_tid = (uintptr_t) &pd->joinstate, .stack = (uintptr_t) stackaddr, .stack_size = stacksize, .tls = (uintptr_t) tp, @@ -351,12 +351,14 @@ start_thread (void *arg) and free any resource prior return to the pthread_create caller. */ setup_failed = pd->setup_failed == 1; if (setup_failed) - pd->joinid = NULL; + pd->joinstate = THREAD_STATE_JOINABLE; /* And give it up right away. */ lll_unlock (pd->lock, LLL_PRIVATE); if (setup_failed) + /* No need to clear the tid here, pthread_create() will join the + thread prior returning to caller. */ goto out; } @@ -481,6 +483,23 @@ start_thread (void *arg) the breakpoint reports TD_THR_RUN state rather than TD_THR_ZOMBIE. */ atomic_bit_set (&pd->cancelhandling, EXITING_BIT); + + /* CONCURRENCY NOTES: + + Concurrent pthread_detach() will either set state to + THREAD_STATE_DETACHED or wait for the thread to terminate. The exiting + state set here is set so a pthread_join() wait until all the required + cleanup steps are done. + + The 'prevstate' field will be used to determine who is responsible to + call __nptl_free_tcb below. */ + + unsigned int prevstate; + do + prevstate = atomic_load_relaxed (&pd->joinstate); + while (!atomic_compare_exchange_weak_acquire (&pd->joinstate, &prevstate, + THREAD_STATE_EXITING)); + if (__glibc_unlikely (atomic_decrement_and_test (&__nptl_nthreads))) /* This was the last thread. */ exit (0); @@ -559,17 +578,17 @@ start_thread (void *arg) pd->setxid_futex = 0; } - /* If the thread is detached free the TCB. */ - if (IS_DETACHED (pd)) - /* Free the TCB. */ + if (prevstate == THREAD_STATE_DETACHED) __nptl_free_tcb (pd); + pd->tid = 0; + out: /* We cannot call '_exit' here. '_exit' will terminate the process. The 'exit' implementation in the kernel will signal when the process is really dead since 'clone' got passed the CLONE_CHILD_CLEARTID - flag. The 'tid' field in the TCB will be set to zero. + flag. The 'joinstate' field in the TCB will be set to zero. The exit code is zero since in case all threads exit by calling 'pthread_exit' the exit status must be 0 (zero). */ @@ -664,10 +683,9 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr, pd->flags = ((iattr->flags & ~(ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET)) | (self->flags & (ATTR_FLAG_SCHED_SET | ATTR_FLAG_POLICY_SET))); - /* Initialize the field for the ID of the thread which is waiting - for us. This is a self-reference in case the thread is created - detached. */ - pd->joinid = iattr->flags & ATTR_FLAG_DETACHSTATE ? pd : NULL; + pd->joinstate = iattr->flags & ATTR_FLAG_DETACHSTATE + ? THREAD_STATE_DETACHED + : THREAD_STATE_JOINABLE; /* The debug events are inherited from the parent. */ pd->eventbuf = self->eventbuf; @@ -826,10 +844,11 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr, /* Similar to pthread_join, but since thread creation has failed at startup there is no need to handle all the steps. */ - pid_t tid; - while ((tid = atomic_load_acquire (&pd->tid)) != 0) - __futex_abstimed_wait_cancelable64 ((unsigned int *) &pd->tid, - tid, 0, NULL, LLL_SHARED); + unsigned int state; + while ((state = atomic_load_acquire (&pd->joinstate)) + != THREAD_STATE_EXITED) + __futex_abstimed_wait_cancelable64 (&pd->joinstate, state, 0, + NULL, LLL_SHARED); } /* State (c) or (d) and we have ownership of PD (see CONCURRENCY diff --git a/nptl/pthread_detach.c b/nptl/pthread_detach.c index 3bfc3c2ff0..c0fe9618a4 100644 --- a/nptl/pthread_detach.c +++ b/nptl/pthread_detach.c @@ -25,32 +25,28 @@ ___pthread_detach (pthread_t th) { struct pthread *pd = (struct pthread *) th; - /* Make sure the descriptor is valid. */ - if (INVALID_NOT_TERMINATED_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; + /* CONCURRENCY NOTES: - int result = 0; + Concurrent pthread_detach() will return EINVAL for the case the thread + is already detached (THREAD_STATE_DETACHED). POSIX states it is + undefined to call pthread_detach if TH refers to a non joinable thread. - /* Mark the thread as detached. */ - if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL)) + For the case the thread is being terminated (THREAD_STATE_EXITING), + pthread_detach() will responsible to clean up the stack. */ + + unsigned int prevstate = atomic_load_relaxed (&pd->joinstate); + do { - /* There are two possibilities here. First, the thread might - already be detached. In this case we return EINVAL. - Otherwise there might already be a waiter. The standard does - not mention what happens in this case. */ - if (IS_DETACHED (pd)) - result = EINVAL; + if (prevstate != THREAD_STATE_JOINABLE) + { + if (prevstate == THREAD_STATE_DETACHED) + return EINVAL; + return __pthread_join (th, 0); + } } - else - /* Check whether the thread terminated meanwhile. In this case we - will just free the TCB. */ - if ((pd->cancelhandling & EXITING_BITMASK) != 0) - /* Note that the code in __free_tcb makes sure each thread - control block is freed only once. */ - __nptl_free_tcb (pd); - - return result; + while (!atomic_compare_exchange_weak_acquire (&pd->joinstate, &prevstate, + THREAD_STATE_DETACHED)); + return 0; } versioned_symbol (libc, ___pthread_detach, pthread_detach, GLIBC_2_34); libc_hidden_ver (___pthread_detach, __pthread_detach) diff --git a/nptl/pthread_getattr_np.c b/nptl/pthread_getattr_np.c index 9d4e7ecff1..73e6137bb6 100644 --- a/nptl/pthread_getattr_np.c +++ b/nptl/pthread_getattr_np.c @@ -52,7 +52,7 @@ __pthread_getattr_np (pthread_t thread_id, pthread_attr_t *attr) iattr->flags = thread->flags; /* The thread might be detached by now. */ - if (IS_DETACHED (thread)) + if (atomic_load_acquire (&thread->joinstate) == THREAD_STATE_DETACHED) iattr->flags |= ATTR_FLAG_DETACHSTATE; /* This is the guardsize after adjusting it. */ diff --git a/nptl/pthread_join.c b/nptl/pthread_join.c index d4cffccf49..37b809034a 100644 --- a/nptl/pthread_join.c +++ b/nptl/pthread_join.c @@ -22,7 +22,7 @@ int ___pthread_join (pthread_t threadid, void **thread_return) { return __pthread_clockjoin_ex (threadid, thread_return, 0 /* Ignored */, - NULL, true); + NULL); } versioned_symbol (libc, ___pthread_join, pthread_join, GLIBC_2_34); libc_hidden_ver (___pthread_join, __pthread_join) diff --git a/nptl/pthread_join_common.c b/nptl/pthread_join_common.c index 7303069316..978ca56af6 100644 --- a/nptl/pthread_join_common.c +++ b/nptl/pthread_join_common.c @@ -22,113 +22,73 @@ #include #include -static void -cleanup (void *arg) +/* Check for a possible deadlock situation where the threads are waiting for + each other to finish. Note that this is a "may" error. To be 100% sure we + catch this error we would have to lock the data structures but it is not + necessary. In the unlikely case that two threads are really caught in this + situation they will deadlock. It is the programmer's problem to figure + this out. */ +static inline bool +check_for_deadlock (struct pthread *pd) { - /* If we already changed the waiter ID, reset it. The call cannot - fail for any reason but the thread not having done that yet so - there is no reason for a loop. */ struct pthread *self = THREAD_SELF; - atomic_compare_exchange_weak_acquire (&arg, &self, NULL); + return ((pd == self + || (atomic_load_acquire (&self->joinstate) == THREAD_STATE_DETACHED + && (pd->cancelhandling + & (CANCELED_BITMASK | EXITING_BITMASK + | TERMINATED_BITMASK)) == 0)) + && !(self->cancelstate == PTHREAD_CANCEL_ENABLE + && (pd->cancelhandling & (CANCELED_BITMASK | EXITING_BITMASK + | TERMINATED_BITMASK)) + == CANCELED_BITMASK)); } int __pthread_clockjoin_ex (pthread_t threadid, void **thread_return, clockid_t clockid, - const struct __timespec64 *abstime, bool block) + const struct __timespec64 *abstime) { struct pthread *pd = (struct pthread *) threadid; - /* Make sure the descriptor is valid. */ - if (INVALID_NOT_TERMINATED_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; - - /* Is the thread joinable?. */ - if (IS_DETACHED (pd)) - /* We cannot wait for the thread. */ - return EINVAL; - - struct pthread *self = THREAD_SELF; - int result = 0; - LIBC_PROBE (pthread_join, 1, threadid); - if ((pd == self - || (self->joinid == pd - && (pd->cancelhandling - & (CANCELED_BITMASK | EXITING_BITMASK - | TERMINATED_BITMASK)) == 0)) - && !(self->cancelstate == PTHREAD_CANCEL_ENABLE - && (pd->cancelhandling & (CANCELED_BITMASK | EXITING_BITMASK - | TERMINATED_BITMASK)) - == CANCELED_BITMASK)) - /* This is a deadlock situation. The threads are waiting for each - other to finish. Note that this is a "may" error. To be 100% - sure we catch this error we would have to lock the data - structures but it is not necessary. In the unlikely case that - two threads are really caught in this situation they will - deadlock. It is the programmer's problem to figure this - out. */ - return EDEADLK; - - /* Wait for the thread to finish. If it is already locked something - is wrong. There can only be one waiter. */ - else if (__glibc_unlikely (atomic_compare_exchange_weak_acquire (&pd->joinid, - &self, - NULL))) - /* There is already somebody waiting for the thread. */ - return EINVAL; - - /* BLOCK waits either indefinitely or based on an absolute time. POSIX also - states a cancellation point shall occur for pthread_join, and we use the - same rationale for posix_timedjoin_np. Both clockwait_tid and the futex - call use the cancellable variant. */ - if (block) + int result = 0; + unsigned int state; + while ((state = atomic_load_acquire (&pd->joinstate)) + != THREAD_STATE_EXITED) { - /* During the wait we change to asynchronous cancellation. If we - are cancelled the thread we are waiting for must be marked as - un-wait-ed for again. */ - pthread_cleanup_push (cleanup, &pd->joinid); - - /* We need acquire MO here so that we synchronize with the - kernel's store to 0 when the clone terminates. (see above) */ - pid_t tid; - while ((tid = atomic_load_acquire (&pd->tid)) != 0) - { - /* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via - futex wake-up when the clone terminates. The memory location - contains the thread ID while the clone is running and is reset to - zero by the kernel afterwards. The kernel up to version 3.16.3 - does not use the private futex operations for futex wake-up when - the clone terminates. */ - int ret = __futex_abstimed_wait_cancelable64 ( - (unsigned int *) &pd->tid, tid, clockid, abstime, LLL_SHARED); - if (ret == ETIMEDOUT || ret == EOVERFLOW) - { - result = ret; - break; - } + if (check_for_deadlock (pd)) + return EDEADLK; + + /* POSIX states calling pthread_join() on a non joinable thread is + undefined. However, if PD is still in the cache we can still warn + the caller. */ + if (state == THREAD_STATE_DETACHED) + return EINVAL; + + /* pthread_join() is a cancellation entrypoint and we use the same + rationale for pthread_timedjoin_np(). + + The kernel notifies a process which uses CLONE_CHILD_CLEARTID via + a memory zeroing and futex wake-up when the process terminates. + The futex operation is not private. */ + int ret = __futex_abstimed_wait_cancelable64 (&pd->joinstate, state, + clockid, abstime, + LLL_SHARED); + if (ret == ETIMEDOUT || ret == EOVERFLOW) + { + result = ret; + break; } - - pthread_cleanup_pop (0); } void *pd_result = pd->result; - if (__glibc_likely (result == 0)) + if (result == 0) { - /* We mark the thread as terminated and as joined. */ - pd->tid = -1; - - /* Store the return value if the caller is interested. */ if (thread_return != NULL) *thread_return = pd_result; - - /* Free the TCB. */ __nptl_free_tcb (pd); } - else - pd->joinid = NULL; LIBC_PROBE (pthread_join_ret, 3, threadid, result, pd_result); diff --git a/nptl/pthread_timedjoin.c b/nptl/pthread_timedjoin.c index a30aef5903..32374170b6 100644 --- a/nptl/pthread_timedjoin.c +++ b/nptl/pthread_timedjoin.c @@ -24,7 +24,7 @@ ___pthread_timedjoin_np64 (pthread_t threadid, void **thread_return, const struct __timespec64 *abstime) { return __pthread_clockjoin_ex (threadid, thread_return, - CLOCK_REALTIME, abstime, true); + CLOCK_REALTIME, abstime); } #if __TIMESIZE == 64 diff --git a/nptl/pthread_tryjoin.c b/nptl/pthread_tryjoin.c index e31c83de9e..60130e9d64 100644 --- a/nptl/pthread_tryjoin.c +++ b/nptl/pthread_tryjoin.c @@ -21,15 +21,17 @@ int __pthread_tryjoin_np (pthread_t threadid, void **thread_return) { - /* Return right away if the thread hasn't terminated yet. */ - struct pthread *pd = (struct pthread *) threadid; - if (pd->tid != 0) - return EBUSY; + /* The joinable state (THREAD_STATE_JOINABLE) is straigthforward since the + thread hasn't finished yet and trying to join might block. + The exiting thread (THREAD_STATE_EXITING) also migth result in ablocking + call: a detached thread might change its state to exiting and a exiting + thread my take some time to exit (and thus let the kernel set the state + to THREAD_STATE_EXITED). */ - /* If pd->tid == 0 then lll_wait_tid will not block on futex - operation. */ - return __pthread_clockjoin_ex (threadid, thread_return, 0 /* Ignored */, - NULL, false); + struct pthread *pd = (struct pthread *) threadid; + return atomic_load_acquire (&pd->joinstate) != THREAD_STATE_EXITED + ? EBUSY + : __pthread_clockjoin_ex (threadid, thread_return, 0, NULL); } versioned_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_34); diff --git a/sysdeps/nptl/dl-tls_init_tp.c b/sysdeps/nptl/dl-tls_init_tp.c index ca494dd3a5..35d54abd92 100644 --- a/sysdeps/nptl/dl-tls_init_tp.c +++ b/sysdeps/nptl/dl-tls_init_tp.c @@ -62,7 +62,7 @@ __tls_init_tp (void) /* Early initialization of the TCB. */ struct pthread *pd = THREAD_SELF; - pd->tid = INTERNAL_SYSCALL_CALL (set_tid_address, &pd->tid); + pd->tid = INTERNAL_SYSCALL_CALL (set_tid_address, &pd->joinstate); THREAD_SETMEM (pd, specific[0], &pd->specific_1stblock[0]); THREAD_SETMEM (pd, user_stack, true); @@ -97,4 +97,6 @@ __tls_init_tp (void) THREAD_SETMEM (pd, cancelstate, PTHREAD_CANCEL_ENABLE); THREAD_SETMEM (pd, canceltype, PTHREAD_CANCEL_DEFERRED); + + THREAD_SETMEM (pd, joinstate, THREAD_STATE_JOINABLE); } diff --git a/sysdeps/nptl/libc_start_call_main.h b/sysdeps/nptl/libc_start_call_main.h index 06d72c1e38..e7a7f7b4c4 100644 --- a/sysdeps/nptl/libc_start_call_main.h +++ b/sysdeps/nptl/libc_start_call_main.h @@ -18,6 +18,7 @@ #include #include +#include _Noreturn static void __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), @@ -65,6 +66,12 @@ __libc_start_call_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), /* One less thread. Decrement the counter. If it is zero we terminate the entire process. */ result = 0; + + /* For the case a thread is waiting for the main thread to finish. */ + struct pthread *self = THREAD_SELF; + atomic_store_release (&self->joinstate, THREAD_STATE_EXITED); + futex_wake (&self->joinstate, 1, FUTEX_SHARED); + if (! atomic_decrement_and_test (&__nptl_nthreads)) /* Not much left to do but to exit the thread, not the process. */ while (1) diff --git a/sysdeps/nptl/pthreadP.h b/sysdeps/nptl/pthreadP.h index aebddb361b..8dfd55e87d 100644 --- a/sysdeps/nptl/pthreadP.h +++ b/sysdeps/nptl/pthreadP.h @@ -242,7 +242,6 @@ libc_hidden_proto (__pthread_current_priority) nothing. And if the test triggers the thread descriptor is guaranteed to be invalid. */ #define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0) -#define INVALID_NOT_TERMINATED_TD_P(pd) __builtin_expect ((pd)->tid < 0, 0) extern void __pthread_unwind (__pthread_unwind_buf_t *__buf) __cleanup_fct_attribute __attribute ((__noreturn__)) @@ -536,7 +535,7 @@ libc_hidden_proto (__pthread_setcanceltype) extern void __pthread_testcancel (void); libc_hidden_proto (__pthread_testcancel) extern int __pthread_clockjoin_ex (pthread_t, void **, clockid_t, - const struct __timespec64 *, bool) + const struct __timespec64 *) attribute_hidden; extern int __pthread_sigmask (int, const sigset_t *, sigset_t *); libc_hidden_proto (__pthread_sigmask); diff --git a/sysdeps/pthread/tst-thrd-detach.c b/sysdeps/pthread/tst-thrd-detach.c index c844767748..e1906a0e10 100644 --- a/sysdeps/pthread/tst-thrd-detach.c +++ b/sysdeps/pthread/tst-thrd-detach.c @@ -20,14 +20,14 @@ #include #include #include - +#include #include static int detach_thrd (void *arg) { - if (thrd_detach (thrd_current ()) != thrd_success) - FAIL_EXIT1 ("thrd_detach failed"); + thrd_sleep (&(struct timespec) { .tv_sec = INT_MAX }, NULL); + thrd_exit (thrd_success); } @@ -36,15 +36,11 @@ do_test (void) { thrd_t id; - /* Create new thread. */ - if (thrd_create (&id, detach_thrd, NULL) != thrd_success) - FAIL_EXIT1 ("thrd_create failed"); + TEST_COMPARE (thrd_create (&id, detach_thrd, NULL), thrd_success); - /* Give some time so the thread can finish. */ - thrd_sleep (&(struct timespec) {.tv_sec = 2}, NULL); + TEST_COMPARE (thrd_detach (id), thrd_success); - if (thrd_join (id, NULL) == thrd_success) - FAIL_EXIT1 ("thrd_join succeed where it should fail"); + TEST_COMPARE (thrd_join (id, NULL), thrd_error); return 0; } From patchwork Thu Sep 30 20:00:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535030 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=K+9Gz65g; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL41M5dQkz9s0r for ; Fri, 1 Oct 2021 06:03:19 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 86389385842B for ; Thu, 30 Sep 2021 20:03:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 86389385842B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032197; bh=xpE2xJCCUTCjyBp4AleIVzQFlOHw0PRqI2CrDKm5JS4=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=K+9Gz65gxoofoW7MJ9UTCAAX+lIZPwXMZTLGjgtjqTd/dPvvy98hSY7crEo12FB5b ffgIOl23V9qE1Hl628lmuqzuLSiH7+Jv011QyZTBkXat6E3yPNR2LMQkzQ/CWkJpVq 7/Ho0ODqSx+Wex8q5ZagbhwnIE0Nus5LgWTVGAvY= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qv1-xf31.google.com (mail-qv1-xf31.google.com [IPv6:2607:f8b0:4864:20::f31]) by sourceware.org (Postfix) with ESMTPS id 79FE63858422 for ; Thu, 30 Sep 2021 20:01:01 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 79FE63858422 Received: by mail-qv1-xf31.google.com with SMTP id jo30so4326116qvb.3 for ; Thu, 30 Sep 2021 13:01:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xpE2xJCCUTCjyBp4AleIVzQFlOHw0PRqI2CrDKm5JS4=; b=fkqsQhAJDiiYZj0nBD2Md1tWfDhVInGhD1Lvt6nqUlhM8bbX0KPKIz2wQm0yQ5pWJp gfSCw14PXsrrl6Yp5n1MCnECbJpW1qvcnP9b6CVCx8frp5LPhNrMI5yGLMJDBsY6zfp3 Bf+sEbvGbxowXkCxO1ZpWM7D9PG000ecWhAwqFDwDyeece6p4TI0hIZ37chjW5Rb+VHY X7Qj9/GoYJpqVDscndiBArYDHmy/srf5RnOSEXnapZMwwsmLP3ZfDEudhYGPNFb7V14s eOhi3UGyP7x1+td8KNqwsjPVTepYlgPqbO31ZVrMwuUVDR1oXy/qOIk7nIHso7shQbb+ 3YcA== X-Gm-Message-State: AOAM532B1bJLmlCxANoGp4FyaROVQtPFPoKSnjKq4XdBCZGnkW46/wvp 7yudfsjzWtnGsTuel8AmnJwWvXdRB1D0tQ== X-Google-Smtp-Source: ABdhPJzgmnywSqIqqkzDQx02AEKRhp0CDMYMfwI28lnwEytgcF9CgfpHcC5veP0CS6uMNa4LrT5aTw== X-Received: by 2002:ad4:44e4:: with SMTP id p4mr5694958qvt.40.1633032060852; Thu, 30 Sep 2021 13:01:00 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.00 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:00 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 04/15] nptl: Move setxid flag out of cancelhandling Date: Thu, 30 Sep 2021 17:00:40 -0300 Message-Id: <20210930200051.1017457-5-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Now that the thread state is tracked by 'joinstate' field, there is no need to keep the setxid flag within the 'cancelhandling'. It simplifies the atomic code to set and reset it (since there is no need to handle the thread state concurrent update). Checked on x86_64-linux-gnu and aarch64-linux-gnu. --- nptl/allocatestack.c | 3 +++ nptl/descr.h | 6 ++--- nptl/nptl_setxid.c | 55 ++++++++++++++----------------------------- nptl/pthread_create.c | 4 ++-- 4 files changed, 26 insertions(+), 42 deletions(-) diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index fa8100719f..74a8bbc19c 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -99,6 +99,7 @@ get_cached_stack (size_t *sizep, void **memp) } /* Don't allow setxid until cloned. */ + result->setxid_flag = 0; result->setxid_futex = -1; /* Dequeue the entry. */ @@ -303,6 +304,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp, #endif /* Don't allow setxid until cloned. */ + pd->setxid_flag = 0; pd->setxid_futex = -1; /* Allocate the DTV for this thread. */ @@ -424,6 +426,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp, #endif /* Don't allow setxid until cloned. */ + pd->setxid_flag = 0; pd->setxid_futex = -1; /* Allocate the DTV for this thread. */ diff --git a/nptl/descr.h b/nptl/descr.h index 76522b85b3..db011af500 100644 --- a/nptl/descr.h +++ b/nptl/descr.h @@ -296,9 +296,6 @@ struct pthread /* Bit set if thread terminated and TCB is freed. */ #define TERMINATED_BIT 5 #define TERMINATED_BITMASK (0x01 << TERMINATED_BIT) - /* Bit set if thread is supposed to change XID. */ -#define SETXID_BIT 6 -#define SETXID_BITMASK (0x01 << SETXID_BIT) /* Flags. Including those copied from the thread attribute. */ int flags; @@ -338,6 +335,9 @@ struct pthread /* Lock to synchronize access to the descriptor. */ int lock; + /* Indicate whether thread is supposed to change XID, it acts a boolean + variable (0 means no operation pending). */ + int setxid_flag; /* Lock for synchronizing setxid calls. */ unsigned int setxid_futex; diff --git a/nptl/nptl_setxid.c b/nptl/nptl_setxid.c index 1bd7b5f803..244536260d 100644 --- a/nptl/nptl_setxid.c +++ b/nptl/nptl_setxid.c @@ -75,14 +75,7 @@ __nptl_setxid_sighandler (int sig, siginfo_t *si, void *ctx) /* Reset the SETXID flag. */ struct pthread *self = THREAD_SELF; - int flags, newval; - do - { - flags = THREAD_GETMEM (self, cancelhandling); - newval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, - flags & ~SETXID_BITMASK, flags); - } - while (flags != newval); + atomic_store_release (&self->setxid_flag, 0); /* And release the futex. */ self->setxid_futex = 1; @@ -96,8 +89,6 @@ libc_hidden_def (__nptl_setxid_sighandler) static void setxid_mark_thread (struct xid_command *cmdp, struct pthread *t) { - int ch; - /* Wait until this thread is cloned. */ if (t->setxid_futex == -1 && ! atomic_compare_and_exchange_bool_acq (&t->setxid_futex, -2, -1)) @@ -108,41 +99,31 @@ setxid_mark_thread (struct xid_command *cmdp, struct pthread *t) /* Don't let the thread exit before the setxid handler runs. */ t->setxid_futex = 0; - do + /* If thread is exiting right now, ignore it. */ + if (atomic_load_acquire (&t->joinstate) == THREAD_STATE_EXITING) { - ch = t->cancelhandling; - - /* If the thread is exiting right now, ignore it. */ - if ((ch & EXITING_BITMASK) != 0) - { - /* Release the futex if there is no other setxid in - progress. */ - if ((ch & SETXID_BITMASK) == 0) - { - t->setxid_futex = 1; - futex_wake (&t->setxid_futex, 1, FUTEX_PRIVATE); - } - return; + /* Release the futex if there is no other setxid in progress. */ + if (atomic_load_relaxed (&t->setxid_flag) == 0) + { + t->setxid_futex = 1; + futex_wake (&t->setxid_futex, 1, FUTEX_PRIVATE); } + return; + } + + /* Release the futex if there is no other setxid in progress. */ + if (atomic_exchange_acquire (&t->setxid_flag, 1) == 0) + { + t->setxid_futex = 1; + futex_wake (&t->setxid_futex, 1, FUTEX_PRIVATE); } - while (atomic_compare_and_exchange_bool_acq (&t->cancelhandling, - ch | SETXID_BITMASK, ch)); } static void setxid_unmark_thread (struct xid_command *cmdp, struct pthread *t) { - int ch; - - do - { - ch = t->cancelhandling; - if ((ch & SETXID_BITMASK) == 0) - return; - } - while (atomic_compare_and_exchange_bool_acq (&t->cancelhandling, - ch & ~SETXID_BITMASK, ch)); + atomic_store_release (&t->setxid_flag, 0); /* Release the futex just in case. */ t->setxid_futex = 1; @@ -153,7 +134,7 @@ setxid_unmark_thread (struct xid_command *cmdp, struct pthread *t) static int setxid_signal_thread (struct xid_command *cmdp, struct pthread *t) { - if ((t->cancelhandling & SETXID_BITMASK) == 0) + if (atomic_load_relaxed (&t->setxid_flag) == 0) return 0; int val; diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index c7d53edbb8..3659f51c46 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -562,7 +562,7 @@ start_thread (void *arg) advise_stack_range (pd->stackblock, pd->stackblock_size, (uintptr_t) pd, pd->guardsize); - if (__glibc_unlikely (pd->cancelhandling & SETXID_BITMASK)) + if (__glibc_unlikely (atomic_load_relaxed (&pd->setxid_flag) == 1)) { /* Some other thread might call any of the setXid functions and expect us to reply. In this case wait until we did that. */ @@ -572,7 +572,7 @@ start_thread (void *arg) condition used in the surrounding loop (cancelhandling). We need to check and document why this is correct. */ futex_wait_simple (&pd->setxid_futex, 0, FUTEX_PRIVATE); - while (pd->cancelhandling & SETXID_BITMASK); + while (atomic_load_relaxed (&pd->setxid_flag) == 1); /* Reset the value so that the stack can be reused. */ pd->setxid_futex = 0; From patchwork Thu Sep 30 20:00:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535033 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=N3gLHf90; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (ip-8-43-85-97.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL43w5XmKz9s0r for ; Fri, 1 Oct 2021 06:05:32 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 9DBD93857C52 for ; Thu, 30 Sep 2021 20:05:30 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9DBD93857C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032330; bh=LWU3lFvKccyPrK+7SyNa/ZrfC78y7k5JZIU1I52Nquo=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=N3gLHf90XVQ6vdolYqso1B29Hk4Nheii7AQF6BfgYkYxANuQJ8hygj0GUgsvtM2Zz YoazBYle5N5EfgacB4QoBIxwrZvCZRD3y0eMiEf1i02BjwELsqoOtkfhfVFAJlWUec frGR1bnE/Dp9oHY+i5pLxZ4spl6OIO8B2rxRH8wo= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) by sourceware.org (Postfix) with ESMTPS id D1FC3385842F for ; Thu, 30 Sep 2021 20:01:02 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D1FC3385842F Received: by mail-qt1-x832.google.com with SMTP id f15so6882765qtv.9 for ; Thu, 30 Sep 2021 13:01:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=LWU3lFvKccyPrK+7SyNa/ZrfC78y7k5JZIU1I52Nquo=; b=Sw0FV5vxCKm0snDuBH2iqAtsPPKOtsuK+P5tRcGw0UrSQ1b5AVoj/b7Ffts7oH8NQ2 ffYaJ6YmyVFfZEChmucbadd2GtzuMr6EnSlHonlAP27dHXLPbovTO17OArvqyrWcVwAd +bAGFu6bLLqbr4CtYQDSHdt38k9lwCNFUWmrOLWkMrjuVMwKNl5nSuRambCYB3t2Ol97 BCJcak/Z6UknAz5iWOXL5rWE6vXmOFLVAn4E/6KHhFExgNmSzIzYal2oo60lyXKNihq5 RSMVmQEKmShKAB9bqa6iUpArnZOPW2wgAQTmmVNswhEDvha5+reqP9I7E74ZQbspyUZG 41nQ== X-Gm-Message-State: AOAM531zn6rjt/xGM/gXIiAkkwXAZhspJFHG7Mi+Z7XSfpmd6Ov6kwWE VyunKFzMMDl93ZH0M9Hb7uY4shptYT+BkQ== X-Google-Smtp-Source: ABdhPJxtR2LavbRU7fb6kD0jxdKr9wHblf3DQBnxigupkPQ5eAweBGIuz03n2svFCm1jukz+pJZRbw== X-Received: by 2002:ac8:435e:: with SMTP id a30mr8701596qtn.227.1633032061900; Thu, 30 Sep 2021 13:01:01 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:01 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 05/15] nptl: Replace struct thread cancelhandling field Date: Thu, 30 Sep 2021 17:00:41 -0300 Message-Id: <20210930200051.1017457-6-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Now that both thread state and setxid is being tracked by two different fields ('joinstate' and 'setxid_flag'), there is no need to keep track of exiting (EXITING_BIT) and terminated (TERMINATED_BIT) state in 'cancelhandling'. The 'cancelhandling' field is renamed to 'cancel_requested' and it only signals whether the thread has been cancelled (set by pthread_cancel()). It allows simplify the atomic operation required to avoid CAS operations. There is no need to check the thread state on __pthread_enable_asynccancel() nor on pthread_testcancel () anymore, since cancellation is explicitlly disabled when thread start the exit code on __do_cancel(). On __nptl_free_tcb(), the 'joinstate' now defines whether it is the creating thread or the created thread that calls it. So there is no concurrent call within the function and thus no need to set the TERMINATED_BIT. For SIGCANCEL handler, sigcancel_handler(), 'joinstate' is used instead (pthread_cancel() might still be called concurrenty in asynchronous mode). Checked on x86_64-linux-gnu and aarch64-linux-gnu. --- nptl/Versions | 1 + nptl/allocatestack.c | 2 +- nptl/cancellation.c | 10 ++-------- nptl/descr.h | 13 ++----------- nptl/nptl_free_tcb.c | 26 +++++++++++--------------- nptl/pthread_cancel.c | 10 ++++------ nptl/pthread_create.c | 10 ++-------- nptl/pthread_join_common.c | 10 +++------- nptl/pthread_testcancel.c | 10 ++-------- nptl_db/structs.def | 2 +- nptl_db/td_thr_get_info.c | 16 +++++++--------- nptl_db/td_thr_getfpregs.c | 9 +++++---- nptl_db/td_thr_getgregs.c | 9 +++++---- nptl_db/td_thr_setfpregs.c | 9 +++++---- nptl_db/td_thr_setgregs.c | 9 +++++---- sysdeps/hppa/nptl/tcb-offsets.sym | 1 - sysdeps/i386/nptl/tcb-offsets.sym | 1 - sysdeps/nptl/pthreadP.h | 3 --- sysdeps/sh/nptl/tcb-offsets.sym | 1 - sysdeps/x86_64/nptl/tcb-offsets.sym | 4 ---- 20 files changed, 56 insertions(+), 100 deletions(-) diff --git a/nptl/Versions b/nptl/Versions index 3221de89d1..3b23c6e248 100644 --- a/nptl/Versions +++ b/nptl/Versions @@ -413,6 +413,7 @@ libc { _thread_db_pthread_eventbuf; _thread_db_pthread_eventbuf_eventmask; _thread_db_pthread_eventbuf_eventmask_event_bits; + _thread_db_pthread_joinstate; _thread_db_pthread_key_data_data; _thread_db_pthread_key_data_level2_data; _thread_db_pthread_key_data_seq; diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index 74a8bbc19c..2b6baf583f 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -119,7 +119,7 @@ get_cached_stack (size_t *sizep, void **memp) *memp = result->stackblock; /* Cancellation handling is back to the default. */ - result->cancelhandling = 0; + result->cancel_requested = 0; result->cancelstate = PTHREAD_CANCEL_ENABLE; result->canceltype = PTHREAD_CANCEL_DEFERRED; result->cleanup = NULL; diff --git a/nptl/cancellation.c b/nptl/cancellation.c index 7cef9487bf..35c1b5c7e2 100644 --- a/nptl/cancellation.c +++ b/nptl/cancellation.c @@ -34,15 +34,9 @@ __pthread_enable_asynccancel (void) int oldval = THREAD_GETMEM (self, canceltype); THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_ASYNCHRONOUS); - int ch = THREAD_GETMEM (self, cancelhandling); - if (self->cancelstate == PTHREAD_CANCEL_ENABLE - && (ch & CANCELED_BITMASK) - && !(ch & EXITING_BITMASK) - && !(ch & TERMINATED_BITMASK)) - { - __do_cancel (); - } + && self->cancel_requested == 1) + __do_cancel (); return oldval; } diff --git a/nptl/descr.h b/nptl/descr.h index db011af500..6dc84ba47e 100644 --- a/nptl/descr.h +++ b/nptl/descr.h @@ -285,17 +285,8 @@ struct pthread struct pthread_unwind_buf *cleanup_jmp_buf; #define HAVE_CLEANUP_JMP_BUF - /* Flags determining processing of cancellation. */ - int cancelhandling; - /* Bit set if canceled. */ -#define CANCELED_BIT 3 -#define CANCELED_BITMASK (0x01 << CANCELED_BIT) - /* Bit set if thread is exiting. */ -#define EXITING_BIT 4 -#define EXITING_BITMASK (0x01 << EXITING_BIT) - /* Bit set if thread terminated and TCB is freed. */ -#define TERMINATED_BIT 5 -#define TERMINATED_BITMASK (0x01 << TERMINATED_BIT) + /* Flag to determine whether the thread is signaled to be cancelled. */ + int cancel_requested; /* Flags. Including those copied from the thread attribute. */ int flags; diff --git a/nptl/nptl_free_tcb.c b/nptl/nptl_free_tcb.c index 987a45f23c..56d5effae3 100644 --- a/nptl/nptl_free_tcb.c +++ b/nptl/nptl_free_tcb.c @@ -23,22 +23,18 @@ void __nptl_free_tcb (struct pthread *pd) { - /* The thread is exiting now. */ - if (atomic_bit_test_set (&pd->cancelhandling, TERMINATED_BIT) == 0) - { - /* Free TPP data. */ - if (pd->tpp != NULL) - { - struct priority_protection_data *tpp = pd->tpp; + /* Free TPP data. */ + if (pd->tpp != NULL) + { + struct priority_protection_data *tpp = pd->tpp; - pd->tpp = NULL; - free (tpp); - } + pd->tpp = NULL; + free (tpp); + } - /* Queue the stack memory block for reuse and exit the process. The - kernel will signal via writing to the address returned by - QUEUE-STACK when the stack is available. */ - __nptl_deallocate_stack (pd); - } + /* Queue the stack memory block for reuse and exit the process. The kernel + will signal via writing to the address of pthread 'joinstate' member + (due CLONE_CHILD_CLEARTID) when the child exits. */ + __nptl_deallocate_stack (pd); } libc_hidden_def (__nptl_free_tcb) diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c index d09947807e..f8cdbb6708 100644 --- a/nptl/pthread_cancel.c +++ b/nptl/pthread_cancel.c @@ -42,11 +42,8 @@ sigcancel_handler (int sig, siginfo_t *si, void *ctx) struct pthread *self = THREAD_SELF; - int ch = atomic_load_relaxed (&self->cancelhandling); - /* Cancelation not enabled, not cancelled, or already exitting. */ if (self->cancelstate == PTHREAD_CANCEL_DISABLE - || (ch & CANCELED_BITMASK) == 0 - || (ch & EXITING_BITMASK) != 0) + || atomic_load_relaxed (&self->joinstate) == THREAD_STATE_EXITING) return; /* Set the return value. */ @@ -93,8 +90,9 @@ __pthread_cancel (pthread_t th) } #endif - int oldch = atomic_fetch_or_acquire (&pd->cancelhandling, CANCELED_BITMASK); - if ((oldch & CANCELED_BITMASK) != 0) + /* If already cancelled just return (cancellation will be acted upon in next + cancellation entrypoint). */ + if (atomic_exchange_relaxed (&pd->cancel_requested, 1) == 1) return 0; if (pd == THREAD_SELF) diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 3659f51c46..4ad5d8de26 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -478,12 +478,6 @@ start_thread (void *arg) } } - /* The thread is exiting now. Don't set this bit until after we've hit - the event-reporting breakpoint, so that td_thr_get_info on us while at - the breakpoint reports TD_THR_RUN state rather than TD_THR_ZOMBIE. */ - atomic_bit_set (&pd->cancelhandling, EXITING_BIT); - - /* CONCURRENCY NOTES: Concurrent pthread_detach() will either set state to @@ -569,8 +563,8 @@ start_thread (void *arg) do /* XXX This differs from the typical futex_wait_simple pattern in that the futex_wait condition (setxid_futex) is different from the - condition used in the surrounding loop (cancelhandling). We need - to check and document why this is correct. */ + condition used in the surrounding loop. We need to check and + document why this is correct. */ futex_wait_simple (&pd->setxid_futex, 0, FUTEX_PRIVATE); while (atomic_load_relaxed (&pd->setxid_flag) == 1); diff --git a/nptl/pthread_join_common.c b/nptl/pthread_join_common.c index 978ca56af6..3fed02d6be 100644 --- a/nptl/pthread_join_common.c +++ b/nptl/pthread_join_common.c @@ -33,14 +33,10 @@ check_for_deadlock (struct pthread *pd) { struct pthread *self = THREAD_SELF; return ((pd == self - || (atomic_load_acquire (&self->joinstate) == THREAD_STATE_DETACHED - && (pd->cancelhandling - & (CANCELED_BITMASK | EXITING_BITMASK - | TERMINATED_BITMASK)) == 0)) + || (atomic_load_acquire (&self->joinstate) + == THREAD_STATE_DETACHED)) && !(self->cancelstate == PTHREAD_CANCEL_ENABLE - && (pd->cancelhandling & (CANCELED_BITMASK | EXITING_BITMASK - | TERMINATED_BITMASK)) - == CANCELED_BITMASK)); + && atomic_load_relaxed (&self->cancel_requested) == 1)); } int diff --git a/nptl/pthread_testcancel.c b/nptl/pthread_testcancel.c index 6c613462ab..a45b8e3176 100644 --- a/nptl/pthread_testcancel.c +++ b/nptl/pthread_testcancel.c @@ -23,14 +23,8 @@ void ___pthread_testcancel (void) { struct pthread *self = THREAD_SELF; - int cancelhandling = THREAD_GETMEM (self, cancelhandling); - if (self->cancelstate == PTHREAD_CANCEL_ENABLE - && (cancelhandling & CANCELED_BITMASK) - && !(cancelhandling & EXITING_BITMASK) - && !(cancelhandling & TERMINATED_BITMASK)) - { - __do_cancel (); - } + if (self->cancelstate == PTHREAD_CANCEL_ENABLE && self->cancel_requested == 1) + __do_cancel (); } versioned_symbol (libc, ___pthread_testcancel, pthread_testcancel, GLIBC_2_34); libc_hidden_ver (___pthread_testcancel, __pthread_testcancel) diff --git a/nptl_db/structs.def b/nptl_db/structs.def index 248ecf4335..65a068e9d1 100644 --- a/nptl_db/structs.def +++ b/nptl_db/structs.def @@ -53,7 +53,7 @@ DB_STRUCT_FIELD (pthread, list) DB_STRUCT_FIELD (pthread, report_events) DB_STRUCT_FIELD (pthread, tid) DB_STRUCT_FIELD (pthread, start_routine) -DB_STRUCT_FIELD (pthread, cancelhandling) +DB_STRUCT_FIELD (pthread, joinstate) DB_STRUCT_FIELD (pthread, schedpolicy) DB_STRUCT_FIELD (pthread, schedparam_sched_priority) DB_STRUCT_FIELD (pthread, specific) diff --git a/nptl_db/td_thr_get_info.c b/nptl_db/td_thr_get_info.c index 7d79bd4152..c3ab444a9f 100644 --- a/nptl_db/td_thr_get_info.c +++ b/nptl_db/td_thr_get_info.c @@ -27,7 +27,7 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop) { td_err_e err; void *copy; - psaddr_t tls, schedpolicy, schedprio, cancelhandling, tid, report_events; + psaddr_t tls, schedpolicy, schedprio, joinstate, tid, report_events; LOG ("td_thr_get_info"); @@ -36,7 +36,7 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop) /* Special case for the main thread before initialization. */ copy = NULL; tls = 0; - cancelhandling = 0; + joinstate = 0; schedpolicy = SCHED_OTHER; schedprio = 0; tid = 0; @@ -75,8 +75,8 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop) err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0); if (err != TD_OK) return err; - err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread, - cancelhandling, 0); + err = DB_GET_FIELD_LOCAL (joinstate, th->th_ta_p, copy, pthread, + joinstate, 0); if (err != TD_OK) return err; err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread, @@ -95,13 +95,11 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop) ? 0 : (uintptr_t) schedprio); infop->ti_type = TD_THR_USER; - if ((((int) (uintptr_t) cancelhandling) & EXITING_BITMASK) == 0) - /* XXX For now there is no way to get more information. */ + int js = (int) (uintptr_t) joinstate; + if (js == THREAD_STATE_JOINABLE || js == THREAD_STATE_DETACHED) infop->ti_state = TD_THR_ACTIVE; - else if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0) - infop->ti_state = TD_THR_ZOMBIE; else - infop->ti_state = TD_THR_UNKNOWN; + infop->ti_state = TD_THR_ZOMBIE; /* Initialization which are the same in both cases. */ infop->ti_ta_p = th->th_ta_p; diff --git a/nptl_db/td_thr_getfpregs.c b/nptl_db/td_thr_getfpregs.c index 4dc4e392e9..1429d9fd8f 100644 --- a/nptl_db/td_thr_getfpregs.c +++ b/nptl_db/td_thr_getfpregs.c @@ -22,7 +22,7 @@ td_err_e td_thr_getfpregs (const td_thrhandle_t *th, prfpregset_t *regset) { - psaddr_t cancelhandling, tid; + psaddr_t joinstate, tid; td_err_e err; LOG ("td_thr_getfpregs"); @@ -33,13 +33,14 @@ td_thr_getfpregs (const td_thrhandle_t *th, prfpregset_t *regset) regset) != PS_OK ? TD_ERR : TD_OK; /* We have to get the state and the PID for this thread. */ - err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread, - cancelhandling, 0); + err = DB_GET_FIELD (joinstate, th->th_ta_p, th->th_unique, pthread, + joinstate, 0); if (err != TD_OK) return err; /* If the thread already terminated we return all zeroes. */ - if (((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) + int js = (int) (uintptr_t) joinstate; + if (js == THREAD_STATE_EXITING || js == THREAD_STATE_EXITED) memset (regset, '\0', sizeof (*regset)); /* Otherwise get the register content through the callback. */ else diff --git a/nptl_db/td_thr_getgregs.c b/nptl_db/td_thr_getgregs.c index 2dfa4fe3c2..1acabe9dc0 100644 --- a/nptl_db/td_thr_getgregs.c +++ b/nptl_db/td_thr_getgregs.c @@ -22,7 +22,7 @@ td_err_e td_thr_getgregs (const td_thrhandle_t *th, prgregset_t regset) { - psaddr_t cancelhandling, tid; + psaddr_t joinstate, tid; td_err_e err; LOG ("td_thr_getgregs"); @@ -33,13 +33,14 @@ td_thr_getgregs (const td_thrhandle_t *th, prgregset_t regset) regset) != PS_OK ? TD_ERR : TD_OK; /* We have to get the state and the PID for this thread. */ - err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread, - cancelhandling, 0); + err = DB_GET_FIELD (joinstate, th->th_ta_p, th->th_unique, pthread, + joinstate, 0); if (err != TD_OK) return err; /* If the thread already terminated we return all zeroes. */ - if (((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) + int js = (int) (uintptr_t) joinstate; + if (js == THREAD_STATE_EXITING || js == THREAD_STATE_EXITED) memset (regset, '\0', sizeof (*regset)); /* Otherwise get the register content through the callback. */ else diff --git a/nptl_db/td_thr_setfpregs.c b/nptl_db/td_thr_setfpregs.c index f4dfc8b97a..04d148e0f4 100644 --- a/nptl_db/td_thr_setfpregs.c +++ b/nptl_db/td_thr_setfpregs.c @@ -22,7 +22,7 @@ td_err_e td_thr_setfpregs (const td_thrhandle_t *th, const prfpregset_t *fpregs) { - psaddr_t cancelhandling, tid; + psaddr_t joinstate, tid; td_err_e err; LOG ("td_thr_setfpregs"); @@ -33,13 +33,14 @@ td_thr_setfpregs (const td_thrhandle_t *th, const prfpregset_t *fpregs) fpregs) != PS_OK ? TD_ERR : TD_OK; /* We have to get the state and the PID for this thread. */ - err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread, - cancelhandling, 0); + err = DB_GET_FIELD (joinstate, th->th_ta_p, th->th_unique, pthread, + joinstate, 0); if (err != TD_OK) return err; /* Only set the registers if the thread hasn't yet terminated. */ - if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0) + int js = (int) (uintptr_t) joinstate; + if (js != THREAD_STATE_EXITING || js != THREAD_STATE_EXITED) { err = DB_GET_FIELD (tid, th->th_ta_p, th->th_unique, pthread, tid, 0); if (err != TD_OK) diff --git a/nptl_db/td_thr_setgregs.c b/nptl_db/td_thr_setgregs.c index 2e5c20f0ea..50dd12b8b3 100644 --- a/nptl_db/td_thr_setgregs.c +++ b/nptl_db/td_thr_setgregs.c @@ -22,7 +22,7 @@ td_err_e td_thr_setgregs (const td_thrhandle_t *th, prgregset_t gregs) { - psaddr_t cancelhandling, tid; + psaddr_t joinstate, tid; td_err_e err; LOG ("td_thr_setgregs"); @@ -33,13 +33,14 @@ td_thr_setgregs (const td_thrhandle_t *th, prgregset_t gregs) gregs) != PS_OK ? TD_ERR : TD_OK; /* We have to get the state and the PID for this thread. */ - err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread, - cancelhandling, 0); + err = DB_GET_FIELD (joinstate, th->th_ta_p, th->th_unique, pthread, + joinstate, 0); if (err != TD_OK) return err; /* Only set the registers if the thread hasn't yet terminated. */ - if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0) + int js = (int) (uintptr_t) joinstate; + if (js != THREAD_STATE_EXITING || js != THREAD_STATE_EXITED) { err = DB_GET_FIELD (tid, th->th_ta_p, th->th_unique, pthread, tid, 0); if (err != TD_OK) diff --git a/sysdeps/hppa/nptl/tcb-offsets.sym b/sysdeps/hppa/nptl/tcb-offsets.sym index 6e852f35b1..8937f1ec21 100644 --- a/sysdeps/hppa/nptl/tcb-offsets.sym +++ b/sysdeps/hppa/nptl/tcb-offsets.sym @@ -3,7 +3,6 @@ RESULT offsetof (struct pthread, result) TID offsetof (struct pthread, tid) -CANCELHANDLING offsetof (struct pthread, cancelhandling) CLEANUP_JMP_BUF offsetof (struct pthread, cleanup_jmp_buf) MULTIPLE_THREADS_OFFSET offsetof (struct pthread, header.multiple_threads) TLS_PRE_TCB_SIZE sizeof (struct pthread) diff --git a/sysdeps/i386/nptl/tcb-offsets.sym b/sysdeps/i386/nptl/tcb-offsets.sym index 2ec9e787c1..85a27dc29f 100644 --- a/sysdeps/i386/nptl/tcb-offsets.sym +++ b/sysdeps/i386/nptl/tcb-offsets.sym @@ -4,7 +4,6 @@ RESULT offsetof (struct pthread, result) TID offsetof (struct pthread, tid) -CANCELHANDLING offsetof (struct pthread, cancelhandling) CLEANUP_JMP_BUF offsetof (struct pthread, cleanup_jmp_buf) MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads) SYSINFO_OFFSET offsetof (tcbhead_t, sysinfo) diff --git a/sysdeps/nptl/pthreadP.h b/sysdeps/nptl/pthreadP.h index 8dfd55e87d..6427a11cd2 100644 --- a/sysdeps/nptl/pthreadP.h +++ b/sysdeps/nptl/pthreadP.h @@ -271,9 +271,6 @@ __exit_thread (void *value) { struct pthread *self = THREAD_SELF; - /* Make sure we get no more cancellations. */ - THREAD_ATOMIC_BIT_SET (self, cancelhandling, EXITING_BIT); - THREAD_SETMEM (self, result, value); /* It is required by POSIX XSH 2.9.5 Thread Cancellation under the heading diff --git a/sysdeps/sh/nptl/tcb-offsets.sym b/sysdeps/sh/nptl/tcb-offsets.sym index 234207779d..60c9e40b72 100644 --- a/sysdeps/sh/nptl/tcb-offsets.sym +++ b/sysdeps/sh/nptl/tcb-offsets.sym @@ -4,7 +4,6 @@ RESULT offsetof (struct pthread, result) TID offsetof (struct pthread, tid) -CANCELHANDLING offsetof (struct pthread, cancelhandling) CLEANUP_JMP_BUF offsetof (struct pthread, cleanup_jmp_buf) MULTIPLE_THREADS_OFFSET offsetof (struct pthread, header.multiple_threads) TLS_PRE_TCB_SIZE sizeof (struct pthread) diff --git a/sysdeps/x86_64/nptl/tcb-offsets.sym b/sysdeps/x86_64/nptl/tcb-offsets.sym index 2bbd563a6c..6cc845f7ed 100644 --- a/sysdeps/x86_64/nptl/tcb-offsets.sym +++ b/sysdeps/x86_64/nptl/tcb-offsets.sym @@ -4,7 +4,6 @@ RESULT offsetof (struct pthread, result) TID offsetof (struct pthread, tid) -CANCELHANDLING offsetof (struct pthread, cancelhandling) CLEANUP_JMP_BUF offsetof (struct pthread, cleanup_jmp_buf) CLEANUP offsetof (struct pthread, cleanup) CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev) @@ -13,6 +12,3 @@ MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads) POINTER_GUARD offsetof (tcbhead_t, pointer_guard) FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1) SSP_BASE_OFFSET offsetof (tcbhead_t, ssp_base) - --- Not strictly offsets, but these values are also used in the TCB. -TCB_CANCELED_BITMASK CANCELED_BITMASK From patchwork Thu Sep 30 20:00:42 2021 Content-Type: text/plain; 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([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.02 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:02 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 06/15] nptl: Use exit_lock when accessing TID on pthread_getaffinity_np Date: Thu, 30 Sep 2021 17:00:42 -0300 Message-Id: <20210930200051.1017457-7-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Also return ESRCH if the thread is already terminated at the time of the call. This is slight better than returning the calling thread affinity (current behaviour), since the thread lifetime is defined. Checked on x86_64-linux-gnu. --- nptl/pthread_getaffinity.c | 28 +++++++++------ sysdeps/pthread/Makefile | 1 + sysdeps/pthread/tst-pthread-exited.c | 51 ++++++++++++++++++++++++++++ 3 files changed, 69 insertions(+), 11 deletions(-) create mode 100644 sysdeps/pthread/tst-pthread-exited.c diff --git a/nptl/pthread_getaffinity.c b/nptl/pthread_getaffinity.c index 3b23a4b50d..7cf239c335 100644 --- a/nptl/pthread_getaffinity.c +++ b/nptl/pthread_getaffinity.c @@ -15,25 +15,31 @@ License along with the GNU C Library; if not, see . */ -#include -#include +#include #include -#include -#include -#include -#include #include int __pthread_getaffinity_np (pthread_t th, size_t cpusetsize, cpu_set_t *cpuset) { - const struct pthread *pd = (const struct pthread *) th; + struct pthread *pd = (struct pthread *) th; - int res = INTERNAL_SYSCALL_CALL (sched_getaffinity, pd->tid, - MIN (INT_MAX, cpusetsize), cpuset); - if (INTERNAL_SYSCALL_ERROR_P (res)) - return INTERNAL_SYSCALL_ERRNO (res); + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); + + int res = pd->tid == 0 + ? -ESRCH + : INTERNAL_SYSCALL_CALL (sched_getaffinity, pd->tid, + MIN (INT_MAX, cpusetsize), cpuset); + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + + if (res < 0) + return -res; /* Clean the rest of the memory the kernel didn't do. */ memset ((char *) cpuset + res, '\0', cpusetsize - res); diff --git a/sysdeps/pthread/Makefile b/sysdeps/pthread/Makefile index d4bd2d4e3e..e4c32f9d65 100644 --- a/sysdeps/pthread/Makefile +++ b/sysdeps/pthread/Makefile @@ -123,6 +123,7 @@ tests += tst-cnd-basic tst-mtx-trylock tst-cnd-broadcast \ tst-pthread_cancel-select-loop \ tst-pthread_kill-exited \ tst-pthread_kill-exiting \ + tst-pthread-exited # tests tests-time64 := \ diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c new file mode 100644 index 0000000000..c27e856dea --- /dev/null +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -0,0 +1,51 @@ +/* Test pthread interface which should return ESRCH when issues along + with a terminated pthread_t. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include + +static void * +noop_thread (void *closure) +{ + return NULL; +} + +static int +do_test (void) +{ + pthread_t thr = xpthread_create (NULL, noop_thread, NULL); + + support_wait_for_thread_exit (); + + { + cpu_set_t cpuset; + int r = pthread_getaffinity_np (thr, sizeof (cpuset), &cpuset); + TEST_COMPARE (r, ESRCH); + } + + xpthread_join (thr); + + return 0; +} + +#include From patchwork Thu Sep 30 20:00:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535034 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=v0PHt23f; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL44s5GcPz9s0r for ; Fri, 1 Oct 2021 06:06:21 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 1ADAE3858C2C for ; Thu, 30 Sep 2021 20:06:19 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1ADAE3858C2C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032379; bh=wdUHfvojZerbtV3uTZp6KR2m5pF9ja1T/m0DkKdH2gU=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=v0PHt23f2dYKD2hoUH7t+AsX4SJavDD7FvRPSegjigonAnHq9rNC6RynAmhuhhuPV WNoyPthKbQstZaaJmfjGOT8OdKIKTw4YHBIdARrsSMbEaWrRcriRYwPSwzge/PGOTr CFwiDQ1BprD2g7WZmFK5G6xFE3A/UZbLY79HcVjo= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x72d.google.com (mail-qk1-x72d.google.com [IPv6:2607:f8b0:4864:20::72d]) by sourceware.org (Postfix) with ESMTPS id AFA283857C53 for ; Thu, 30 Sep 2021 20:01:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org AFA283857C53 Received: by mail-qk1-x72d.google.com with SMTP id 72so7048153qkk.7 for ; Thu, 30 Sep 2021 13:01:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wdUHfvojZerbtV3uTZp6KR2m5pF9ja1T/m0DkKdH2gU=; b=nWJDUuCCVWEJ6lOam2BbnO0eTMoRKLzL2RqlaGJsBqKyUAdlG9sLw9tjmxuMiHbczZ be1zYeF7axyKefkCHjlLT6YKaKgZ53PgYv9BXw9hb69L49Q7wq0Dmqfb38ILPwr0us53 mbUgiS8V/gdixM9ebsYZMCHzoRzZRH8LpmBh80S8VBDenmRV9NQaJyw553/75+3FcF91 sTLtAGEwOfpOc676vk1uM8zt81EUQWZExake9KMxK5Ndk7Blh1rKuRDIh5ag6NNM87V+ rMGOPKeopf9+qi3upR2PXA2EREhhmK6QqR7k1F61f5smKqj0G6ZX/CHF25vwEOw3DSdj dDHw== X-Gm-Message-State: AOAM5337GYZsfjBYheOglZXYZFRT0Su8rBhfRm9TbAyzXiU6CUN7epPr 8k7inJT9KWXR9gVAVfmyDKPDKsW0UStPqg== X-Google-Smtp-Source: ABdhPJxCVjLiNIvvM4+vPsk0tQWciqcb0Am9c2SbI166x8XxC2wA/qLyZ9hJcYKQelLBFEvp6WjwtA== X-Received: by 2002:a37:a60f:: with SMTP id p15mr6548581qke.114.1633032064103; Thu, 30 Sep 2021 13:01:04 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.03 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:03 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 07/15] nptl: Use exit_lock when accessing TID on pthread_setaffinity Date: Thu, 30 Sep 2021 17:00:43 -0300 Message-Id: <20210930200051.1017457-8-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Also return ESRCH if the thread is already terminated at the time of the call. This is slight better than setting the calling thread affinity (current behaviour). Checked on x86_64-linux-gnu. --- nptl/pthread_setaffinity.c | 25 +++++++++++++++---------- sysdeps/pthread/tst-pthread-exited.c | 7 +++++++ 2 files changed, 22 insertions(+), 10 deletions(-) diff --git a/nptl/pthread_setaffinity.c b/nptl/pthread_setaffinity.c index 2ae6ae694c..cefc48e7c5 100644 --- a/nptl/pthread_setaffinity.c +++ b/nptl/pthread_setaffinity.c @@ -15,10 +15,8 @@ License along with the GNU C Library; if not, see . */ -#include +#include #include -#include -#include #include @@ -26,15 +24,22 @@ int __pthread_setaffinity_new (pthread_t th, size_t cpusetsize, const cpu_set_t *cpuset) { - const struct pthread *pd = (const struct pthread *) th; - int res; + struct pthread *pd = (struct pthread *) th; - res = INTERNAL_SYSCALL_CALL (sched_setaffinity, pd->tid, cpusetsize, - cpuset); + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); - return (INTERNAL_SYSCALL_ERROR_P (res) - ? INTERNAL_SYSCALL_ERRNO (res) - : 0); + int res = pd->tid == 0 + ? ESRCH + : -INTERNAL_SYSCALL_CALL (sched_setaffinity, pd->tid, cpusetsize, + cpuset); + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + + return res; } versioned_symbol (libc, __pthread_setaffinity_new, pthread_setaffinity_np, GLIBC_2_34); diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index c27e856dea..567d6b9b49 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -43,6 +43,13 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + cpu_set_t cpuset; + CPU_ZERO (&cpuset); + int r = pthread_setaffinity_np (thr, sizeof (cpuset), &cpuset); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535035 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=xBEyuBHK; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL45g3rntz9s0r for ; Fri, 1 Oct 2021 06:07:03 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 625793857C6C for ; Thu, 30 Sep 2021 20:07:01 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 625793857C6C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032421; bh=sjE49JWIdy2xYlX6iKwTZ7uGMcsmC/Zcl/H71OG39tQ=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=xBEyuBHKJaxImXv2nF5Bemc25yAs2/XP5kmMPRK55GDeZCZOV81RBY3JCTt+am0oR lackQGMeNAslp1yHjHLeG6LZ+m1cS6GrHPucIJShkr0HcouIHZjzrAKD21J+yWyInA B4a+UrbZCabWCBzgUIVnABPyc+CliSVFu2L33MpA= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x72b.google.com (mail-qk1-x72b.google.com [IPv6:2607:f8b0:4864:20::72b]) by sourceware.org (Postfix) with ESMTPS id 161323857C62 for ; Thu, 30 Sep 2021 20:01:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 161323857C62 Received: by mail-qk1-x72b.google.com with SMTP id 194so7017550qkj.11 for ; Thu, 30 Sep 2021 13:01:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=sjE49JWIdy2xYlX6iKwTZ7uGMcsmC/Zcl/H71OG39tQ=; b=NM70OqBbgDIog/a4XEtiSPcTIm1QisfMaHjmobhxLmguJ4QaBBfObV5EiVO0MkYMGX F/bV/0OEnbcplvXzfLHfdAH4PmDDmlLVXJKGXF91AAaBTwvovR+xpZj1LYfteJxzT6qQ LjUNjKNJGhximblyZpbA6El7uffX/1DPvb9wNTrbD5SmH3xmCiq5ZrUA8prgkzrMMpTB TwxyJc8KNPOqa2qadG2ry2vPiBvXHhq2KJmcCRsi+hS6JPUjZW8k047FvxtxMkOA/0yF 1SkuZXhN0YE5qZhXQA7hLsB7yGscxPdcDttAvom9dBoJCsgAuLYaoFvhK9+uWGkgoajv AEog== X-Gm-Message-State: AOAM530T3tBTGp19/FlY+NhFC+k8L3aLVsSWdNQPm6mI9x5B+Mu56Swe vmU59aM8SE7IXzNZoRwFd+Sr98z9xvOcQg== X-Google-Smtp-Source: ABdhPJyORa1aBcCG89Ube+cGGsjrup51siVNFz8AKuA+2d89GE5jdC0ewFUF30MxTRoqFXOQknGQYA== X-Received: by 2002:a37:a155:: with SMTP id k82mr6363345qke.349.1633032065491; Thu, 30 Sep 2021 13:01:05 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.04 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:04 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 08/15] nptl: Use exit_lock when accessing TID on pthread_getcpuclockid Date: Thu, 30 Sep 2021 17:00:44 -0300 Message-Id: <20210930200051.1017457-9-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Checked on x86_64-linux-gnu. --- nptl/pthread_getcpuclockid.c | 26 ++++++++++++++------------ sysdeps/pthread/tst-pthread-exited.c | 7 +++++++ 2 files changed, 21 insertions(+), 12 deletions(-) diff --git a/nptl/pthread_getcpuclockid.c b/nptl/pthread_getcpuclockid.c index 0a6656ea4c..63f1978665 100644 --- a/nptl/pthread_getcpuclockid.c +++ b/nptl/pthread_getcpuclockid.c @@ -16,11 +16,9 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, see . */ -#include -#include -#include -#include +#include #include +#include #include int @@ -28,17 +26,21 @@ __pthread_getcpuclockid (pthread_t threadid, clockid_t *clockid) { struct pthread *pd = (struct pthread *) threadid; - /* Make sure the descriptor is valid. */ - if (INVALID_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); - /* The clockid_t value is a simple computation from the TID. */ + int res = 0; + if (pd->tid != 0) + *clockid = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED); + else + res = ESRCH; - const clockid_t tidclock = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED); + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); - *clockid = tidclock; - return 0; + return res; } versioned_symbol (libc, __pthread_getcpuclockid, pthread_getcpuclockid, GLIBC_2_34); diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index 567d6b9b49..d33e6b28fe 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -23,6 +23,7 @@ #include #include #include +#include static void * noop_thread (void *closure) @@ -50,6 +51,12 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + clockid_t clkid; + int r = pthread_getcpuclockid (thr, &clkid); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535036 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=vDuwnZY2; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL46V1d55z9s0r for ; Fri, 1 Oct 2021 06:07:46 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 0FC163857C63 for ; Thu, 30 Sep 2021 20:07:44 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0FC163857C63 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032464; bh=SO2veMYLGehM7MDG+iWNlZU9U0x8pZJ0hwuO/t7d1r4=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=vDuwnZY285Sh4VfN/ZRrI652WU5qirXfozjHDveh1RQXV/VZSZYv74EKSasNb0oLF nfPc0mhRXl/bq0W1tUteo27vFDnBmrHa3slHeWsVKLn7hdRUSk+oF5nV8exyAdSSZ9 2pArxekgu+/bZqK7MvTX9l2lDYaDR/wCVq9N5oxk= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by sourceware.org (Postfix) with ESMTPS id 411E03857C5B for ; Thu, 30 Sep 2021 20:01:07 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 411E03857C5B Received: by mail-qt1-x829.google.com with SMTP id j13so6906216qtq.6 for ; Thu, 30 Sep 2021 13:01:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SO2veMYLGehM7MDG+iWNlZU9U0x8pZJ0hwuO/t7d1r4=; b=hgw1OaF/MAJ/CKHRGyEb+ohp+hkRw7+m9tx2M92gEq9Vq4pmBUbVb3Jh/Hdz7r06/s 1J+Q+MUSjW21kUntZ1z2jI/EJt3pasNTmwGIOhiyPbnk1JPF1kFpjLiUaYK74qKKgEcH 8vfhHCfpSGkfojIntX2ZLAJEHwC/fzNTy6aqimrtMUs7/PTprE9YfkaeLynJXeDYwfrh plvczZxSZqcmSduwdBS7cieamV+8cSZP1uH4BmDcQd5xGnaiKkZKtkqGY10+q+zyW+aC fYdIbivae4C9IN1ENyLZzoGVC1N6VnjmAWk1fikMAkh8TrqWptsy6w4RNRb/UcGlBAhj jKGQ== X-Gm-Message-State: AOAM531OW2VyE8vQb9RU9rpnk59mU2lsUUSzGlYkuRh4aUXQ7uq91Njw E+i8o9K5KtX0Fy+w7egdmgSHrOn298E6pw== X-Google-Smtp-Source: ABdhPJxo1xoXJ1ouo5mcaKXPoyArQ4Q7/GwA+HDIDkXTlDoSEYeAVWVziX1UjJ39BWhPnijasyeOPw== X-Received: by 2002:ac8:4156:: with SMTP id e22mr1215671qtm.14.1633032066539; Thu, 30 Sep 2021 13:01:06 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.05 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:06 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 09/15] nptl: Use exit_lock when accessing TID on pthread_setschedparam Date: Thu, 30 Sep 2021 17:00:45 -0300 Message-Id: <20210930200051.1017457-10-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" The sched_getparam call is also replaced with a INTERNAL_SYSCALL_CALL to avoid clobbering errno. Checked on x86_64-linux-gnu. --- nptl/pthread_setschedparam.c | 51 +++++++++++++++------------- sysdeps/pthread/tst-pthread-exited.c | 6 ++++ 2 files changed, 34 insertions(+), 23 deletions(-) diff --git a/nptl/pthread_setschedparam.c b/nptl/pthread_setschedparam.c index f38bd788af..d6027824db 100644 --- a/nptl/pthread_setschedparam.c +++ b/nptl/pthread_setschedparam.c @@ -15,26 +15,15 @@ License along with the GNU C Library; if not, see . */ -#include -#include -#include -#include "pthreadP.h" -#include +#include +#include +#include -int -__pthread_setschedparam (pthread_t threadid, int policy, - const struct sched_param *param) +static int +setschedparam (struct pthread *pd, int policy, + const struct sched_param *param) { - struct pthread *pd = (struct pthread *) threadid; - - /* Make sure the descriptor is valid. */ - if (INVALID_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; - - int result = 0; - /* See CREATE THREAD NOTES in nptl/pthread_create.c. */ lll_lock (pd->lock, LLL_PRIVATE); @@ -43,8 +32,7 @@ __pthread_setschedparam (pthread_t threadid, int policy, /* If the thread should have higher priority because of some PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */ - if (__builtin_expect (pd->tpp != NULL, 0) - && pd->tpp->priomax > param->sched_priority) + if (pd->tpp != NULL && pd->tpp->priomax > param->sched_priority) { p = *param; p.sched_priority = pd->tpp->priomax; @@ -52,10 +40,8 @@ __pthread_setschedparam (pthread_t threadid, int policy, } /* Try to set the scheduler information. */ - if (__builtin_expect (__sched_setscheduler (pd->tid, policy, - param) == -1, 0)) - result = errno; - else + int r = INTERNAL_SYSCALL_CALL (sched_setscheduler, pd->tid, policy, param); + if (r == 0) { /* We succeeded changing the kernel information. Reflect this change in the thread descriptor. */ @@ -66,6 +52,25 @@ __pthread_setschedparam (pthread_t threadid, int policy, lll_unlock (pd->lock, LLL_PRIVATE); + return -r; +} + +int +__pthread_setschedparam (pthread_t threadid, int policy, + const struct sched_param *param) +{ + struct pthread *pd = (struct pthread *) threadid; + + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); + + int result = pd->tid != 0 ? setschedparam (pd, policy, param) : ESRCH; + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + return result; } strong_alias (__pthread_setschedparam, pthread_setschedparam) diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index d33e6b28fe..208546a546 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -57,6 +57,12 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + struct sched_param sch = { 0 }; + int r = pthread_setschedparam (thr, SCHED_FIFO, &sch); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535039 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=T59vQueJ; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL4923zrPz9s0r for ; Fri, 1 Oct 2021 06:09:58 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 30FB5385843F for ; Thu, 30 Sep 2021 20:09:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 30FB5385843F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032596; bh=Zwc0d6DUlPsV+wYjRCzGvhWlY71tDx9bnrc+dRk7sVk=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=T59vQueJq7qpHE6zcAo75ICssr4lQZMNRRaKuCLDn8opQ1vDJBC0/a7AvsPxTgg3j ssYw1eX1iKWmNXRAljqLbhPORq0ATxjH8DdiohpZ0fal7j+mKAk4MjNhETlXROyI1t 1QNUNArGSV7qf+0/VOV/6h7wRrCADDC04n1sqUVU= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by sourceware.org (Postfix) with ESMTPS id 3FB253857C69 for ; Thu, 30 Sep 2021 20:01:11 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 3FB253857C69 Received: by mail-qt1-x82b.google.com with SMTP id d8so6892223qtd.5 for ; Thu, 30 Sep 2021 13:01:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Zwc0d6DUlPsV+wYjRCzGvhWlY71tDx9bnrc+dRk7sVk=; b=FHK1uZP1NZaSGYG7R12AI/xmEp+2u7ZNAzQN7lwQ2YRAmlwyVypxCmb0hIzE/qySs7 in6VuCqlTl/27yADIvLqqYejTwnVLtELrxlAmfIFwNReB2bFT6bNo3h9I+E2uMngPgDi EFGHp2PLFT4y4pu/vz+qfNpYQURfXB6dMkedKd6sjnB7hxB6G9TWvUYIr+MnLzb2mpnp 04OnXv2+ScOtDcdU2cYCsKpSWQdguJ9d596EyfsfOSdHHGzceJ39GC6wAj6TD26hntI3 6lTrZyp4iTV+Ov4xUqh8VzBL8z7Tj7jjTP7ddv5LIBDkGfzIopzj+vlR1Yx4qa9qP/zA iVjg== X-Gm-Message-State: AOAM532XXasYxIvZJzKxpYBY0IxZrimCCTTsag+hKQi1UC3ObS+vpMF9 naF+eKMDMKV8Il2AC8nGcSyD9dcAmnnJvw== X-Google-Smtp-Source: ABdhPJwKUreh1LAk8t/GDm9FqpJUN7JdfKPXy4g66jXo9S2w/Nirnz9png8Pl80MpzgAKcxR2glQ6Q== X-Received: by 2002:ac8:6e8f:: with SMTP id c15mr8710738qtv.179.1633032067647; Thu, 30 Sep 2021 13:01:07 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.06 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:07 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 10/15] nptl: Use exit_lock when accessing TID on pthread_getschedparam Date: Thu, 30 Sep 2021 17:00:46 -0300 Message-Id: <20210930200051.1017457-11-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" The sched_getparam call is also replaced with a INTERNAL_SYSCALL_CALL to avoid clobbering errno. Checked on x86_64-linux-gnu. --- nptl/pthread_getschedparam.c | 55 +++++++++++++++------------- sysdeps/pthread/tst-pthread-exited.c | 7 ++++ 2 files changed, 37 insertions(+), 25 deletions(-) diff --git a/nptl/pthread_getschedparam.c b/nptl/pthread_getschedparam.c index ef4022b8ac..09d07c8a17 100644 --- a/nptl/pthread_getschedparam.c +++ b/nptl/pthread_getschedparam.c @@ -15,24 +15,14 @@ License along with the GNU C Library; if not, see . */ -#include -#include -#include "pthreadP.h" -#include +#include +#include +#include - -int -__pthread_getschedparam (pthread_t threadid, int *policy, - struct sched_param *param) +static int +getschedparam (struct pthread *pd, int *policy, struct sched_param *param) { - struct pthread *pd = (struct pthread *) threadid; - - /* Make sure the descriptor is valid. */ - if (INVALID_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; - - int result = 0; + int r = 0; /* See CREATE THREAD NOTES in nptl/pthread_create.c. */ lll_lock (pd->lock, LLL_PRIVATE); @@ -44,22 +34,18 @@ __pthread_getschedparam (pthread_t threadid, int *policy, not yet been retrieved do it now. */ if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0) { - if (__sched_getparam (pd->tid, &pd->schedparam) != 0) - result = 1; - else + r = INTERNAL_SYSCALL_CALL (sched_getparam, pd->tid, &pd->schedparam); + if (r == 0) pd->flags |= ATTR_FLAG_SCHED_SET; } - if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0) { - pd->schedpolicy = __sched_getscheduler (pd->tid); - if (pd->schedpolicy == -1) - result = 1; - else + r = pd->schedpolicy = INTERNAL_SYSCALL_CALL (sched_getscheduler, pd->tid); + if (r >= 0) pd->flags |= ATTR_FLAG_POLICY_SET; } - if (result == 0) + if (r >= 0) { *policy = pd->schedpolicy; memcpy (param, &pd->schedparam, sizeof (struct sched_param)); @@ -67,6 +53,25 @@ __pthread_getschedparam (pthread_t threadid, int *policy, lll_unlock (pd->lock, LLL_PRIVATE); + return -r; +} + +int +__pthread_getschedparam (pthread_t threadid, int *policy, + struct sched_param *param) +{ + struct pthread *pd = (struct pthread *) threadid; + + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); + + int result = pd->tid != 0 ? getschedparam (pd, policy, param) : ESRCH; + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + return result; } libc_hidden_def (__pthread_getschedparam) diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index 208546a546..25015d4f74 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -63,6 +63,13 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + struct sched_param sch; + int policy; + int r = pthread_getschedparam (thr, &policy, &sch); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535037 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=KTj3SGtr; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL47P3qwSz9s0r for ; Fri, 1 Oct 2021 06:08:33 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 63D533857C52 for ; Thu, 30 Sep 2021 20:08:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 63D533857C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032511; bh=8y4zVnf/76Txiw60vm+XKTuDxdEaiAVGnIw+E0qbM9A=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=KTj3SGtr7ZvvoyAJI7L7vnPsLTf07zK/g+Uhd+i9vCHbzWlcIDkKlgBg4TX6c+L6s AXOKmx6nXtiQlT7OvAqtx8iGF77L7t579J3B9tB3H/hUQr9yz6cuFJEdCtoJ267GQH 2klL7qsFdl/zHINhXSOUsCl7eWNtkQ686z/Ihzxk= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x736.google.com (mail-qk1-x736.google.com [IPv6:2607:f8b0:4864:20::736]) by sourceware.org (Postfix) with ESMTPS id 769D03857C56 for ; Thu, 30 Sep 2021 20:01:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 769D03857C56 Received: by mail-qk1-x736.google.com with SMTP id i132so7082940qke.1 for ; Thu, 30 Sep 2021 13:01:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8y4zVnf/76Txiw60vm+XKTuDxdEaiAVGnIw+E0qbM9A=; b=2nipWy/LOjQqYmn3jwfRvqIiAK2yRBwfVkrpGkCd7NXB6MYqcvCcV8qiHdQcbKBcF/ K2zNMDKUb5iTKh16KVrI48ZQX0sIgRwsjfXt007nv/L1NiRGKsxfrMrHxS4h1ZdB6PJk TOD8y9pzunltMIxO+sId+CsxMfXpc6+owuroU4jGK9jA7I2wZbiKZPyJP3ZHogQoRahj +OOUQxmLr3Oof06JPcudI7VuIcNvJAez7Vio5NRGUppbOrRiUYeEt0VrpLhC5WqTkAyM K6LGOFoGcT+zqCIZq9PuuJSptl2DbRZGH7QkGiCvoNB2XU3oPwWfa0g8QUh71oFr/HJ9 NJww== X-Gm-Message-State: AOAM5324xk28w0X1acLhqbMe8ENs+pY7dBi/NUKlyLz10H+bhoh8p9B2 HIwWjHob4ul/4KID4QSDgW3aOf0HHMQXBg== X-Google-Smtp-Source: ABdhPJzqqWb509ayLCWsgqvGWBfE8k7GYeMrvRResXLfM+vrgKGZfALp44G8tBa5Bd5WD139fNajLA== X-Received: by 2002:a37:bfc3:: with SMTP id p186mr6349048qkf.479.1633032068832; Thu, 30 Sep 2021 13:01:08 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.07 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:08 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 11/15] nptl: Use exit_lock when accessing TID on pthread_getname_np Date: Thu, 30 Sep 2021 17:00:47 -0300 Message-Id: <20210930200051.1017457-12-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Checked on x86_64-linux-gnu. --- nptl/pthread_getname.c | 45 +++++++++++++++++----------- sysdeps/pthread/tst-pthread-exited.c | 6 ++++ 2 files changed, 34 insertions(+), 17 deletions(-) diff --git a/nptl/pthread_getname.c b/nptl/pthread_getname.c index 8ac814366a..26011b55c9 100644 --- a/nptl/pthread_getname.c +++ b/nptl/pthread_getname.c @@ -18,10 +18,12 @@ #include #include +#include #include #include #include #include +#include #include #include #include @@ -29,7 +31,7 @@ int __pthread_getname_np (pthread_t th, char *buf, size_t len) { - const struct pthread *pd = (const struct pthread *) th; + struct pthread *pd = (struct pthread *) th; /* Unfortunately the kernel headers do not export the TASK_COMM_LEN macro. So we have to define it here. */ @@ -40,29 +42,38 @@ __pthread_getname_np (pthread_t th, char *buf, size_t len) if (pd == THREAD_SELF) return __prctl (PR_GET_NAME, buf) ? errno : 0; -#define FMT "/proc/self/task/%u/comm" - char fname[sizeof (FMT) + 8]; - sprintf (fname, FMT, (unsigned int) pd->tid); + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); - int fd = __open64_nocancel (fname, O_RDONLY); - if (fd == -1) - return errno; + char fname[sizeof ("/proc/self/task//comm" ) + INT_BUFSIZE_BOUND (pid_t)]; + __snprintf (fname, sizeof (fname), "/proc/self/task/%d/comm", pd->tid); int res = 0; - ssize_t n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, len)); - if (n < 0) - res = errno; - else + int fd = __open64_nocancel (fname, O_RDONLY); + if (fd != -1) { - if (buf[n - 1] == '\n') - buf[n - 1] = '\0'; - else if (n == len) - res = ERANGE; + ssize_t n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, len)); + if (n > 0) + { + if (buf[n - 1] == '\n') + buf[n - 1] = '\0'; + else if (n == len) + res = ERANGE; + else + buf[n] = '\0'; + } else - buf[n] = '\0'; + res = errno; + + __close_nocancel_nostatus (fd); } + else + res = errno == ENOENT ? ESRCH : errno; - __close_nocancel_nostatus (fd); + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); return res; } diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index 25015d4f74..6638afbf88 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -70,6 +70,12 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + char thread_name[32]; + int r = pthread_getname_np (thr, thread_name, 32); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535038 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=bsFnGUrd; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL48C50fVz9s0r for ; Fri, 1 Oct 2021 06:09:15 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 9F1FF385843F for ; Thu, 30 Sep 2021 20:09:13 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9F1FF385843F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032553; bh=AkJTYeEnxhQuiUp+hDM7PB/IFaq/rn9bB+LFBNfDIBA=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=bsFnGUrdNNdfMW302nL0aSw0357a95hJvOiqFYjfI6IRuUkWDaiYGYcpRMJA9OFiT WyC+sxJLgiMr/Wcl2qfJTW7NIYdV95ix6upPHFSWmeZyuQcgdBBaa+b7Jii0WTrHPW YNOQXnt4Btloqa44LnHf+WZlRuZ9VTJbIx4oc6ow= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x82a.google.com (mail-qt1-x82a.google.com [IPv6:2607:f8b0:4864:20::82a]) by sourceware.org (Postfix) with ESMTPS id 7E8A53857C51 for ; Thu, 30 Sep 2021 20:01:10 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 7E8A53857C51 Received: by mail-qt1-x82a.google.com with SMTP id r1so6852990qta.12 for ; Thu, 30 Sep 2021 13:01:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=AkJTYeEnxhQuiUp+hDM7PB/IFaq/rn9bB+LFBNfDIBA=; b=DPgMIA0zDbCzp6bPI07oLQHN3hUhAsEu+eR547upGMdO6Ew/UkRz0yJ5y/rav6XtDD KYVFTEPS20G3nt+Vmbi9Y11v4HEI+s0X9Z+ZByEUSIIIpcIi5kYTfFTxRcTxktYaeG/Q H0LbxPLVi8Qm7mlcMoAMqgBh7fgIPqgnYh4Fz3908FBcmsQJTvjVn3AB1pKXWBbIlrXU XjpAsnF0B6oqBhqgAvvjAZURv0uh2gI9f1cgsegHFhZv+cm/cWiF6ZtuRptzX72257vT tMYbD3PCYLbH1KVCFPYoVeSfmBk8JNwY3m+MgZ0TBNH7kiNFWUNq4wSNM1y23GLHfm8a lo1Q== X-Gm-Message-State: AOAM530B0SFQlH2vpQxc9JsuTPmdry8C5TpfKbvgJ66iTkB/6SCYTiSp IFD8MQ/JosBsTA2f7U+9V5I0MwEzyj24bA== X-Google-Smtp-Source: ABdhPJwURctA1qNcFs+Fy7usb9F1zYkaG56wP0nCSPDm1hHmO/o69bKt01J02qz5apFi6u75tCrDQg== X-Received: by 2002:ac8:5287:: with SMTP id s7mr8833567qtn.359.1633032069930; Thu, 30 Sep 2021 13:01:09 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.09 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:09 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 12/15] nptl: Use exit_lock when accessing TID on pthread_setname_np Date: Thu, 30 Sep 2021 17:00:48 -0300 Message-Id: <20210930200051.1017457-13-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Checked on x86_64-linux-gnu. --- nptl/pthread_setname.c | 38 ++++++++++++++++++---------- sysdeps/pthread/tst-pthread-exited.c | 6 +++++ 2 files changed, 30 insertions(+), 14 deletions(-) diff --git a/nptl/pthread_setname.c b/nptl/pthread_setname.c index 6d2d8a1723..8aa31616d2 100644 --- a/nptl/pthread_setname.c +++ b/nptl/pthread_setname.c @@ -18,19 +18,20 @@ #include #include +#include #include #include #include #include #include - +#include #include int __pthread_setname_np (pthread_t th, const char *name) { - const struct pthread *pd = (const struct pthread *) th; + struct pthread *pd = (struct pthread *) th; /* Unfortunately the kernel headers do not export the TASK_COMM_LEN macro. So we have to define it here. */ @@ -42,22 +43,31 @@ __pthread_setname_np (pthread_t th, const char *name) if (pd == THREAD_SELF) return __prctl (PR_SET_NAME, name) ? errno : 0; -#define FMT "/proc/self/task/%u/comm" - char fname[sizeof (FMT) + 8]; - sprintf (fname, FMT, (unsigned int) pd->tid); + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); - int fd = __open64_nocancel (fname, O_RDWR); - if (fd == -1) - return errno; + char fname[sizeof ("/proc/self/task//comm" ) + INT_BUFSIZE_BOUND (pid_t)]; + __snprintf (fname, sizeof (fname), "/proc/self/task/%d/comm", pd->tid); int res = 0; - ssize_t n = TEMP_FAILURE_RETRY (__write_nocancel (fd, name, name_len)); - if (n < 0) - res = errno; - else if (n != name_len) - res = EIO; + int fd = __open64_nocancel (fname, O_RDWR); + if (fd != -1) + { + ssize_t n = TEMP_FAILURE_RETRY (__write_nocancel (fd, name, name_len)); + if (n < 0) + res = errno; + else if (n != name_len) + res = EIO; + + __close_nocancel_nostatus (fd); + } + else + res = errno == ENOENT ? ESRCH : errno; - __close_nocancel_nostatus (fd); + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); return res; } diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index 6638afbf88..eaaf00a9b4 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -76,6 +76,12 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + char thread_name[] = "test"; + int r = pthread_setname_np (thr, thread_name); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535040 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=eG/NLceE; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL49r71JXz9s0r for ; Fri, 1 Oct 2021 06:10:40 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 8520B3858433 for ; Thu, 30 Sep 2021 20:10:38 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8520B3858433 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032638; bh=jfBLO0Wz+nvbhfmpRBFGKAjWsAlJSjHasZZZF/rtW90=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=eG/NLceEDOi2gLpaLr8w43JLaPO+FVRgfd2xzDiccC8/QLXMHZFmr+I9eqyUTEsmi IV0tRbioWknLgey8rg4bAmahQJbozMYGzrII43EorFw6IBujcqFQHgmGYahg1kzcYv zAvhEeyX8VICiMd3Zuy105Rnpb5FLGuk7Zf61OGw= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) by sourceware.org (Postfix) with ESMTPS id 980C43857C5B for ; Thu, 30 Sep 2021 20:01:11 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 980C43857C5B Received: by mail-qt1-x832.google.com with SMTP id t2so6874525qtx.8 for ; Thu, 30 Sep 2021 13:01:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jfBLO0Wz+nvbhfmpRBFGKAjWsAlJSjHasZZZF/rtW90=; b=At+Q+4ZQV3wCrBJVatDAu8DC4NDBFZk5AC3CEN/j2/waYiC3178eWS2+xbyGyo9pxG oh1Il/+RGWO16jsGW1LbIrOlYKfcZrU+PslA1gk27P3uxi6xhaB97DlsC8Uhj59laQhW XiJyqLtBA1FYdjoTfuMw2AT5j/d6z4ceDvtdOsHfrBdpQoAcc/Zz5kax4la0UFiBuXPy PEbQtt8yZPbrMcz6GzcYvhmjqJ8MTSoW11HxsGrhRS8pwaHLcbUmOh3/aIGSt691YSLg vOPXyFIEwPpLWPo5XlCz5YYkFWaC2o3ajAU4wF/fDBN4TnI71Yrv+P3tcnhtQW6Ht1fa 0vRg== X-Gm-Message-State: AOAM532l8/p/O4DePJinpPOwD+o8IijyuxZi2x39w/iOeElcuP5r3rYT W6Aq63atOOZs3GeaTWZLozacUObo1KH1sA== X-Google-Smtp-Source: ABdhPJz2JluHfrZnleIjcnXKUh0euJZgIw1sYrdkOK5ugLRr680V6QdIxws6Z+wLlS1Y3gqvn7ybfg== X-Received: by 2002:ac8:7519:: with SMTP id u25mr8758390qtq.151.1633032071027; Thu, 30 Sep 2021 13:01:11 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.10 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:10 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 13/15] nptl: Use exit_lock when accessing TID on pthread_sigqueue Date: Thu, 30 Sep 2021 17:00:49 -0300 Message-Id: <20210930200051.1017457-14-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Checked on x86_64-linux-gnu. --- nptl/pthread_sigqueue.c | 56 ++++++++++++++-------------- sysdeps/pthread/tst-pthread-exited.c | 6 +++ 2 files changed, 34 insertions(+), 28 deletions(-) diff --git a/nptl/pthread_sigqueue.c b/nptl/pthread_sigqueue.c index edc18bf4c0..c4a1e0a04d 100644 --- a/nptl/pthread_sigqueue.c +++ b/nptl/pthread_sigqueue.c @@ -16,6 +16,7 @@ . */ #include +#include #include #include #include @@ -27,41 +28,40 @@ int __pthread_sigqueue (pthread_t threadid, int signo, const union sigval value) { -#ifdef __NR_rt_tgsigqueueinfo - struct pthread *pd = (struct pthread *) threadid; - - /* Force load of pd->tid into local variable or register. Otherwise - if a thread exits between ESRCH test and tgkill, we might return - EINVAL, because pd->tid would be cleared by the kernel. */ - pid_t tid = atomic_forced_read (pd->tid); - if (__glibc_unlikely (tid <= 0)) - /* Not a valid thread handle. */ - return ESRCH; - /* Disallow sending the signal we use for cancellation, timers, for the setxid implementation. */ if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID) return EINVAL; - pid_t pid = getpid (); + struct pthread *pd = (struct pthread *) threadid; - /* Set up the siginfo_t structure. */ - siginfo_t info; - memset (&info, '\0', sizeof (siginfo_t)); - info.si_signo = signo; - info.si_code = SI_QUEUE; - info.si_pid = pid; - info.si_uid = __getuid (); - info.si_value = value; + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); - /* We have a special syscall to do the work. */ - int val = INTERNAL_SYSCALL_CALL (rt_tgsigqueueinfo, pid, tid, signo, - &info); - return (INTERNAL_SYSCALL_ERROR_P (val) - ? INTERNAL_SYSCALL_ERRNO (val) : 0); -#else - return ENOSYS; -#endif + int res; + if (pd->tid != 0) + { + pid_t pid = getpid (); + + siginfo_t info = { 0 }; + info.si_signo = signo; + info.si_code = SI_QUEUE; + info.si_pid = pid; + info.si_uid = __getuid (); + info.si_value = value; + + res = -INTERNAL_SYSCALL_CALL (rt_tgsigqueueinfo, pid, pd->tid, signo, + &info); + } + else + res = ESRCH; + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + + return res; } versioned_symbol (libc, __pthread_sigqueue, pthread_sigqueue, GLIBC_2_34); diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index eaaf00a9b4..bfb3870cb6 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -82,6 +82,12 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + union sigval value = { 0 }; + int r = pthread_sigqueue (thr, SIGUSR1, value); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535041 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=duQtaRaj; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (ip-8-43-85-97.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL4Bh2LWKz9s0r for ; Fri, 1 Oct 2021 06:11:24 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id DD1F13857C52 for ; Thu, 30 Sep 2021 20:11:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org DD1F13857C52 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032681; bh=6V+Nku939b083NtMm1HRkepbf9cojg+PAEbJXALEf3k=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=duQtaRajz96gsrxqLMu0mYRXdWSnwxwgr9xxspujajAoJsWt5+YEClIWaHPo0xblb OZMH4mDwz+zKvwhqY5fqQItVu7rfCWLe9jEPPRPtPvA5FNJe02bHkY5MMuR405b0Ld WBlcRZ51+cjoKG52vtzcJJnFSKwBdPjrnkQmmyGs= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by sourceware.org (Postfix) with ESMTPS id CB7DD3857C6C for ; Thu, 30 Sep 2021 20:01:12 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org CB7DD3857C6C Received: by mail-qt1-x829.google.com with SMTP id e16so6906032qts.4 for ; Thu, 30 Sep 2021 13:01:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6V+Nku939b083NtMm1HRkepbf9cojg+PAEbJXALEf3k=; b=QlbPWROtW/f/7tGmInQNFIE3NbwPw2WvkxcHR0zA6kXfSCVVO9viNdjTnk/5FdtA0g CVOG+2pGGPg92r95FqLReK5TAGNTQJRArcswWg+/K+WW5Zq6k25IkayYFjCO2KOqyg/U /bdgq2SZRZ0mdGkPlMsoz3CfjcIw6og7Vu7xpaX5DA7qtBQGARjf2gwQ2oZb0H2z8rSO ZlY3BSmnWuGZSlRmv8YrIwEZ74MZ9QUjPVjO5WlDK4V9kqjat/yGjcBuMtmlSqb8RIrw P4kZR1O6j3qICZhohVhpgvwgthpcPEeAn8AWNqSCkX8uduMWznjlInqneXpiPAZQLx1g rtpw== X-Gm-Message-State: AOAM532vYwhFGBGfIqqw0RfiJ8OdWFPdx/42QwYHANR33X5odHdp+z/1 Z1IxU6hMZ6kPoH28CK9zx+g9gwv6a95HYg== X-Google-Smtp-Source: ABdhPJx+fC+y+zzgbjjg4dzhVSG0nxSNFckAB5SGvOO2lqrIybl/YHMreTt7KDkXNl9EJiHDBnnd+A== X-Received: by 2002:ac8:538a:: with SMTP id x10mr8524861qtp.251.1633032072236; Thu, 30 Sep 2021 13:01:12 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.11 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:11 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 14/15] nptl: Use exit_lock when accessing TID on pthread_setschedprio Date: Thu, 30 Sep 2021 17:00:50 -0300 Message-Id: <20210930200051.1017457-15-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" Checked on x86_64-linux-gnu --- nptl/pthread_setschedprio.c | 45 +++++++++++++++------------- sysdeps/pthread/tst-pthread-exited.c | 5 ++++ 2 files changed, 30 insertions(+), 20 deletions(-) diff --git a/nptl/pthread_setschedprio.c b/nptl/pthread_setschedprio.c index c095e346c8..65cf8912ca 100644 --- a/nptl/pthread_setschedprio.c +++ b/nptl/pthread_setschedprio.c @@ -15,25 +15,13 @@ License along with the GNU C Library; if not, see . */ -#include -#include -#include -#include -#include "pthreadP.h" -#include +#include +#include #include -int -__pthread_setschedprio (pthread_t threadid, int prio) +static int +setschedprio (struct pthread *pd, int prio) { - struct pthread *pd = (struct pthread *) threadid; - - /* Make sure the descriptor is valid. */ - if (INVALID_TD_P (pd)) - /* Not a valid thread handle. */ - return ESRCH; - - int result = 0; struct sched_param param; param.sched_priority = prio; @@ -42,13 +30,12 @@ __pthread_setschedprio (pthread_t threadid, int prio) /* If the thread should have higher priority because of some PTHREAD_PRIO_PROTECT mutexes it holds, adjust the priority. */ - if (__builtin_expect (pd->tpp != NULL, 0) && pd->tpp->priomax > prio) + if (pd->tpp != NULL && pd->tpp->priomax > prio) param.sched_priority = pd->tpp->priomax; /* Try to set the scheduler information. */ - if (__glibc_unlikely (__sched_setparam (pd->tid, ¶m) == -1)) - result = errno; - else + int r = INTERNAL_SYSCALL_CALL (sched_setparam, pd->tid, ¶m); + if (r == 0) { /* We succeeded changing the kernel information. Reflect this change in the thread descriptor. */ @@ -59,6 +46,24 @@ __pthread_setschedprio (pthread_t threadid, int prio) lll_unlock (pd->lock, LLL_PRIVATE); + return -r; +} + +int +__pthread_setschedprio (pthread_t threadid, int prio) +{ + struct pthread *pd = (struct pthread *) threadid; + + /* Block all signals, as required by pd->exit_lock. */ + sigset_t old_mask; + __libc_signal_block_all (&old_mask); + __libc_lock_lock (pd->exit_lock); + + int result = pd->tid != 0 ? setschedprio (pd, prio) : ESRCH; + + __libc_lock_unlock (pd->exit_lock); + __libc_signal_restore_set (&old_mask); + return result; } versioned_symbol (libc, __pthread_setschedprio, pthread_setschedprio, diff --git a/sysdeps/pthread/tst-pthread-exited.c b/sysdeps/pthread/tst-pthread-exited.c index bfb3870cb6..03cf2e21a1 100644 --- a/sysdeps/pthread/tst-pthread-exited.c +++ b/sysdeps/pthread/tst-pthread-exited.c @@ -88,6 +88,11 @@ do_test (void) TEST_COMPARE (r, ESRCH); } + { + int r = pthread_setschedprio (thr, 0); + TEST_COMPARE (r, ESRCH); + } + xpthread_join (thr); return 0; From patchwork Thu Sep 30 20:00:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 1535042 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=hV87POdb; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=2620:52:3:1:0:246e:9693:128c; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Received: from sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4HL4Cc1hXWz9s0r for ; Fri, 1 Oct 2021 06:12:11 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 2460A3858433 for ; Thu, 30 Sep 2021 20:12:09 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2460A3858433 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1633032729; bh=0Tfigzir3uI2SZYLegvOuYMtuh+E/V1G/NmsaRtO1c4=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=hV87POdbyE1lXlwyP/jd6+Mhuyz3cyev8N/XDfxhPD13wOiRwewHTCvX3fIptEj5m 9LYTu0fCXHIWEV5qTT2hozcYeO/sp+OlxrMITZwFJznK7vGrNXq2Ouq1SmFDkTWS9i PflR6MHfu88lPQtZNpKA59Rys+O0mNJjvdJu6GU0= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x733.google.com (mail-qk1-x733.google.com [IPv6:2607:f8b0:4864:20::733]) by sourceware.org (Postfix) with ESMTPS id C60FE3857C71 for ; Thu, 30 Sep 2021 20:01:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C60FE3857C71 Received: by mail-qk1-x733.google.com with SMTP id d207so7111966qkg.0 for ; Thu, 30 Sep 2021 13:01:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=0Tfigzir3uI2SZYLegvOuYMtuh+E/V1G/NmsaRtO1c4=; b=mLSKKE1UK/xX7tX9F5LADocR6cV/2yPela2CtQ3R1bKchvLBZg1ifVm4/7diCax8p7 NDl6+W++Zi8QZuH/7kXbmRaaiorDCJHofZYd8skAbtrHzhKgZ2ZpSKPPgej+6TG3ScnH tu5ToycH+XyVFreldFjbLs7siUYwD/CsVoNRqV5qWteqe7V/l0y1hKe0BsWQLpCHycll Gg+WRr9QsApb/rM7fKQwN5AqH7b9SlOwRIjTgahEpyypKl4GOsRdiTTU8ZEiQx2bE+Lp 50NLIHTuOvVugWvsa2A7soTXqTPCvdUNzQmNLkUr+9FNpA/GeI/eEqAukllmiVZEN6oO BqHw== X-Gm-Message-State: AOAM532zKI2PUC8enAu3d8dikQQ10NBnHqvXzDS5WTI2wXjOJWVxz3rg O478iQKuxgoxTEvckPUu1hCo/FI5UcJ/Gw== X-Google-Smtp-Source: ABdhPJxZq8frMsamijCNJ1Y6vJOMM7rZYcYFAa87ecF0DI+xN5eCU6W7WhPr8naehHrxKTEX3Gtt8w== X-Received: by 2002:a37:46d6:: with SMTP id t205mr6779808qka.131.1633032073248; Thu, 30 Sep 2021 13:01:13 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:b20e:53f8:8b5:1bb2]) by smtp.gmail.com with ESMTPSA id r196sm1910203qka.119.2021.09.30.13.01.12 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 13:01:13 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH 15/15] nptl: Remove INVALID_TD_P Date: Thu, 30 Sep 2021 17:00:51 -0300 Message-Id: <20210930200051.1017457-16-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> References: <20210930200051.1017457-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org Sender: "Libc-alpha" It is not used anymore. --- sysdeps/nptl/pthreadP.h | 5 ----- 1 file changed, 5 deletions(-) diff --git a/sysdeps/nptl/pthreadP.h b/sysdeps/nptl/pthreadP.h index 6427a11cd2..2c053428d1 100644 --- a/sysdeps/nptl/pthreadP.h +++ b/sysdeps/nptl/pthreadP.h @@ -238,11 +238,6 @@ libc_hidden_proto (__pthread_tpp_change_priority) extern int __pthread_current_priority (void); libc_hidden_proto (__pthread_current_priority) -/* This will not catch all invalid descriptors but is better than - nothing. And if the test triggers the thread descriptor is - guaranteed to be invalid. */ -#define INVALID_TD_P(pd) __builtin_expect ((pd)->tid <= 0, 0) - extern void __pthread_unwind (__pthread_unwind_buf_t *__buf) __cleanup_fct_attribute __attribute ((__noreturn__)) #if !defined SHARED && !IS_IN (libpthread)