From patchwork Thu Jan 26 16:37:57 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 138069 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id D95ACB6EE8 for ; Fri, 27 Jan 2012 08:28:42 +1100 (EST) Received: from localhost ([::1]:59419 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSIR-0000Sa-EE for incoming@patchwork.ozlabs.org; Thu, 26 Jan 2012 11:35:35 -0500 Received: from eggs.gnu.org ([140.186.70.92]:60386) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSHw-00009y-Pr for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:35:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RqSHp-0003Jx-LQ for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:35:04 -0500 Received: from mx1.redhat.com ([209.132.183.28]:26927) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSHp-0003Jt-CH for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:34:57 -0500 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q0QGYt4J017357 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 26 Jan 2012 11:34:55 -0500 Received: from dhcp-5-188.str.redhat.com (dhcp-5-175.str.redhat.com [10.32.5.175]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id q0QGYoXp031205; Thu, 26 Jan 2012 11:34:55 -0500 From: Kevin Wolf To: anthony@codemonkey.ws Date: Thu, 26 Jan 2012 17:37:57 +0100 Message-Id: <1327595896-19623-4-git-send-email-kwolf@redhat.com> In-Reply-To: <1327595896-19623-1-git-send-email-kwolf@redhat.com> References: <1327595896-19623-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.132.183.28 Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [Qemu-devel] [PATCH 03/22] coroutine: add co_sleep_ns() coroutine sleep function X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- Makefile.objs | 1 + qemu-coroutine-sleep.c | 38 ++++++++++++++++++++++++++++++++++++++ qemu-coroutine.h | 9 +++++++++ 3 files changed, 48 insertions(+), 0 deletions(-) create mode 100644 qemu-coroutine-sleep.c diff --git a/Makefile.objs b/Makefile.objs index 9ca6063..48d1477 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -13,6 +13,7 @@ oslib-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o ####################################################################### # coroutines coroutine-obj-y = qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o +coroutine-obj-y += qemu-coroutine-sleep.o ifeq ($(CONFIG_UCONTEXT_COROUTINE),y) coroutine-obj-$(CONFIG_POSIX) += coroutine-ucontext.o else diff --git a/qemu-coroutine-sleep.c b/qemu-coroutine-sleep.c new file mode 100644 index 0000000..fd65274 --- /dev/null +++ b/qemu-coroutine-sleep.c @@ -0,0 +1,38 @@ +/* + * QEMU coroutine sleep + * + * Copyright IBM, Corp. 2011 + * + * Authors: + * Stefan Hajnoczi + * + * This work is licensed under the terms of the GNU LGPL, version 2 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include "qemu-coroutine.h" +#include "qemu-timer.h" + +typedef struct CoSleepCB { + QEMUTimer *ts; + Coroutine *co; +} CoSleepCB; + +static void co_sleep_cb(void *opaque) +{ + CoSleepCB *sleep_cb = opaque; + + qemu_free_timer(sleep_cb->ts); + qemu_coroutine_enter(sleep_cb->co, NULL); +} + +void coroutine_fn co_sleep_ns(QEMUClock *clock, int64_t ns) +{ + CoSleepCB sleep_cb = { + .co = qemu_coroutine_self(), + }; + sleep_cb.ts = qemu_new_timer(clock, SCALE_NS, co_sleep_cb, &sleep_cb); + qemu_mod_timer(sleep_cb.ts, qemu_get_clock_ns(clock) + ns); + qemu_coroutine_yield(); +} diff --git a/qemu-coroutine.h b/qemu-coroutine.h index 8a55fe1..34c15d4 100644 --- a/qemu-coroutine.h +++ b/qemu-coroutine.h @@ -17,6 +17,7 @@ #include #include "qemu-queue.h" +#include "qemu-timer.h" /** * Coroutines are a mechanism for stack switching and can be used for @@ -199,4 +200,12 @@ void qemu_co_rwlock_wrlock(CoRwlock *lock); */ void qemu_co_rwlock_unlock(CoRwlock *lock); +/** + * Yield the coroutine for a given duration + * + * Note this function uses timers and hence only works when a main loop is in + * use. See main-loop.h and do not use from qemu-tool programs. + */ +void coroutine_fn co_sleep_ns(QEMUClock *clock, int64_t ns); + #endif /* QEMU_COROUTINE_H */