[2/3] Refactor nanosleep in terms of clock_nanosleep

Message ID	20191106125245.28102-2-adhemerval.zanella@linaro.org
State	New
Headers	show Return-Path: <libc-alpha-return-106684-incoming=patchwork.ozlabs.org@sourceware.org> DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:date:message-id:in-reply-to :references; q=dns; s=default; b=iXyS48ELCo4fA1n7PFzaWsMriVRc/OY F/mubsSib4XyaeM82LZBy1jzCVyoIzRuc0Ij2Qo/X3JFsgfaUhK6+4ZbQ924kf47 RdlLdAsu6+NJh/tJ9fM2Q4bnAW3hFfm9biU1wHgwaa1BhKzxO+NJv+t2aQb1J4Lt Bx9j3suIEQaw= Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk Sender: libc-alpha-owner@sourceware.org From: Adhemerval Zanella <adhemerval.zanella@linaro.org> To: libc-alpha@sourceware.org Subject: [PATCH 2/3] Refactor nanosleep in terms of clock_nanosleep Date: Wed, 6 Nov 2019 09:52:44 -0300 Message-Id: <20191106125245.28102-2-adhemerval.zanella@linaro.org> In-Reply-To: <20191106125245.28102-1-adhemerval.zanella@linaro.org> References: <20191106125245.28102-1-adhemerval.zanella@linaro.org>
Series	[1/3] nptl: Move nanosleep implementation to libc \| expand [1/3] nptl: Move nanosleep implementation to libc [2/3] Refactor nanosleep in terms of clock_nanosleep [3/3] nptl: Refactor thrd_sleep in terms of clock_nanosleep

diff --git a/include/time.h b/include/time.h index 8ac58e891b..b3e635395d 100644 --- a/include/time.h +++ b/include/time.h @@ -25,6 +25,9 @@ libc_hidden_proto (__clock_gettime) extern __typeof (clock_settime) __clock_settime; libc_hidden_proto (__clock_settime) +extern __typeof (clock_nanosleep) __clock_nanosleep; +libc_hidden_proto (__clock_nanosleep); + #ifdef __linux__ extern __typeof (clock_adjtime) __clock_adjtime; libc_hidden_proto (__clock_adjtime); diff --git a/posix/nanosleep.c b/posix/nanosleep.c index d8564c7119..ed41c8cce7 100644 --- a/posix/nanosleep.c +++ b/posix/nanosleep.c @@ -24,10 +24,13 @@ int __nanosleep (const struct timespec *requested_time, struct timespec *remaining) { - __set_errno (ENOSYS); - return -1; + int ret = __clock_nanosleep (CLOCK_REALTIME, 0, requested_time, remaining); + if (ret != 0) + { + __set_errno (ret); + return -1; + } + return 0; } -stub_warning (nanosleep) - -hidden_def (__nanosleep) +libc_hidden_def (__nanosleep) weak_alias (__nanosleep, nanosleep) diff --git a/sysdeps/unix/clock_nanosleep.c b/sysdeps/mach/clock_nanosleep.c similarity index 59% rename from sysdeps/unix/clock_nanosleep.c rename to sysdeps/mach/clock_nanosleep.c index 8514a439ee..6a0792d684 100644 --- a/sysdeps/unix/clock_nanosleep.c +++ b/sysdeps/mach/clock_nanosleep.c @@ -1,5 +1,5 @@ -/* High-resolution sleep with the specified clock. - Copyright (C) 2000-2019 Free Software Foundation, Inc. +/* clock_nanosleep - high-resolution sleep with specifiable clock. + Copyright (C) 2002-2019 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 @@ -16,28 +16,70 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <assert.h> #include <errno.h> +#include <mach.h> #include <time.h> -#include <sysdep-cancel.h> +#include <unistd.h> #include <shlib-compat.h> -/* This implementation assumes that these is only a `nanosleep' system - call. So we have to remap all other activities. */ +static struct timespec +timespec_sub (struct timespec a, struct timespec b) +{ + struct timespec result = { a.tv_sec - b.tv_sec, + a.tv_nsec - b.tv_nsec }; + if (result.tv_nsec < 0) + { + --result.tv_sec; + result.tv_nsec += 1000000000ul; + } + return result; +} + +static int +nanosleep_call (const struct timespec *req, struct timespec *rem) +{ + mach_port_t recv; + struct timespec before; + error_t err; + + const mach_msg_timeout_t ms + = req->tv_sec * 1000 + + (req->tv_nsec + 999999) / 1000000; + + recv = __mach_reply_port (); + + if (rem != NULL) + __clock_gettime (CLOCK_REALTIME, &before); + + err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT, + 0, 0, recv, ms, MACH_PORT_NULL); + __mach_port_destroy (mach_task_self (), recv); + if (err == EMACH_RCV_INTERRUPTED) + { + if (rem != NULL) + { + struct timespec after, elapsed; + __clock_gettime (CLOCK_REALTIME, &after); + elapsed = timespec_sub (after, before); + *rem = timespec_sub (*req, elapsed); + } + + return EINTR; + } + + return 0; +} + int __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, struct timespec *rem) { - struct timespec now; - - if (! valid_nanoseconds (req->tv_nsec)) + if (clock_id != CLOCK_REALTIME + || !valid_nanoseconds (req->tv_nsec) + || (flags != 0 || flags != TIMER_ABSTIME)) return EINVAL; - if (clock_id == CLOCK_THREAD_CPUTIME_ID) - return EINVAL; /* POSIX specifies EINVAL for this case. */ - - if (clock_id < CLOCK_REALTIME || clock_id > CLOCK_THREAD_CPUTIME_ID) - return EINVAL; + struct timespec now; /* If we got an absolute time, remap it. */ if (flags == TIMER_ABSTIME) @@ -68,15 +110,10 @@ __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, /* Make sure we are not modifying the struct pointed to by REM. */ rem = NULL; } - else if (flags != 0) - return EINVAL; - else if (clock_id != CLOCK_REALTIME) - /* Not supported. */ - return ENOTSUP; - return __nanosleep (req, rem), 0 ? errno : 0; + return nanosleep_call (req, rem); } - +libc_hidden_def (__clock_nanosleep) versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17); /* clock_nanosleep moved to libc in version 2.17; old binaries may expect the symbol version it had in librt. */ diff --git a/sysdeps/mach/nanosleep.c b/sysdeps/mach/nanosleep.c deleted file mode 100644 index b60a2179f6..0000000000 --- a/sysdeps/mach/nanosleep.c +++ /dev/null @@ -1,79 +0,0 @@ -/* nanosleep -- sleep for a period specified with a struct timespec - Copyright (C) 2002-2019 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 - <https://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <mach.h> -#include <time.h> -#include <unistd.h> - -# define timespec_sub(a, b, result) \ - do { \ - (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ - (result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \ - if ((result)->tv_nsec < 0) { \ - --(result)->tv_sec; \ - (result)->tv_nsec += 1000000000; \ - } \ - } while (0) - -int -__libc_nanosleep (const struct timespec *requested_time, - struct timespec *remaining) -{ - mach_port_t recv; - struct timespec before; - error_t err; - - if (requested_time->tv_sec < 0 - || ! valid_nanoseconds (requested_time->tv_nsec)) - { - errno = EINVAL; - return -1; - } - - const mach_msg_timeout_t ms - = requested_time->tv_sec * 1000 - + (requested_time->tv_nsec + 999999) / 1000000; - - recv = __mach_reply_port (); - - if (remaining != 0) - __clock_gettime (CLOCK_REALTIME, &before); - - err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT, - 0, 0, recv, ms, MACH_PORT_NULL); - __mach_port_destroy (mach_task_self (), recv); - if (err == EMACH_RCV_INTERRUPTED) - { - if (remaining != 0) - { - struct timespec after, elapsed; - __clock_gettime (CLOCK_REALTIME, &after); - timespec_sub (&after, &before, &elapsed); - timespec_sub (requested_time, &elapsed, remaining); - } - - errno = EINTR; - return -1; - } - - return 0; -} -weak_alias(__libc_nanosleep, __nanosleep) -libc_hidden_def (__nanosleep) -weak_alias (__libc_nanosleep, nanosleep) diff --git a/sysdeps/unix/sysv/linux/clock_nanosleep.c b/sysdeps/unix/sysv/linux/clock_nanosleep.c index 1f240b8720..f3c6fd2d5f 100644 --- a/sysdeps/unix/sysv/linux/clock_nanosleep.c +++ b/sysdeps/unix/sysv/linux/clock_nanosleep.c @@ -42,7 +42,7 @@ __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, return (INTERNAL_SYSCALL_ERROR_P (r, err) ? INTERNAL_SYSCALL_ERRNO (r, err) : 0); } - +libc_hidden_def (__clock_nanosleep) versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17); /* clock_nanosleep moved to libc in version 2.17; old binaries may expect the symbol version it had in librt. */ diff --git a/sysdeps/unix/sysv/linux/nanosleep.c b/sysdeps/unix/sysv/linux/nanosleep.c deleted file mode 100644 index 6787909248..0000000000 --- a/sysdeps/unix/sysv/linux/nanosleep.c +++ /dev/null @@ -1,31 +0,0 @@ -/* Linux nanosleep syscall implementation. - Copyright (C) 2017-2019 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 - <https://www.gnu.org/licenses/>. */ - -#include <time.h> -#include <sysdep-cancel.h> -#include <not-cancel.h> - -/* Pause execution for a number of nanoseconds. */ -int -__nanosleep (const struct timespec *requested_time, - struct timespec *remaining) -{ - return SYSCALL_CANCEL (nanosleep, requested_time, remaining); -} -hidden_def (__nanosleep) -weak_alias (__nanosleep, nanosleep) diff --git a/time/clock_nanosleep.c b/time/clock_nanosleep.c index 5952d29195..d4fc16f6ec 100644 --- a/time/clock_nanosleep.c +++ b/time/clock_nanosleep.c @@ -33,7 +33,7 @@ __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, /* Not implemented. */ return ENOSYS; } - +libc_hidden_def (__clock_nanosleep) versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17); /* clock_nanosleep moved to libc in version 2.17; old binaries may expect the symbol version it had in librt. */

[2/3] Refactor nanosleep in terms of clock_nanosleep

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