143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <pthread.h>
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#include "thr_private.h"
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static int suspend_common(struct pthread *, struct pthread *,
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int);
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__weak_reference(_pthread_suspend_np, pthread_suspend_np);
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__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
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/* Suspend a thread: */
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int
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_pthread_suspend_np(pthread_t thread)
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{
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struct pthread *curthread = _get_curthread();
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int ret;
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/* Suspending the current thread doesn't make sense. */
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if (thread == _get_curthread())
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ret = EDEADLK;
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/* Add a reference to the thread: */
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else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0))
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== 0) {
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/* Lock the threads scheduling queue: */
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THR_THREAD_LOCK(curthread, thread);
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suspend_common(curthread, thread, 1);
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/* Unlock the threads scheduling queue: */
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THR_THREAD_UNLOCK(curthread, thread);
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/* Don't forget to remove the reference: */
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_thr_ref_delete(curthread, thread);
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}
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return (ret);
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}
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void
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_pthread_suspend_all_np(void)
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{
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struct pthread *curthread = _get_curthread();
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struct pthread *thread;
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int ret;
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THREAD_LIST_LOCK(curthread);
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TAILQ_FOREACH(thread, &_thread_list, tle) {
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if (thread != curthread) {
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THR_THREAD_LOCK(curthread, thread);
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if (thread->state != PS_DEAD &&
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!(thread->flags & THR_FLAGS_SUSPENDED))
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thread->flags |= THR_FLAGS_NEED_SUSPEND;
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THR_THREAD_UNLOCK(curthread, thread);
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}
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}
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thr_kill(-1, SIGCANCEL);
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restart:
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TAILQ_FOREACH(thread, &_thread_list, tle) {
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if (thread != curthread) {
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/* First try to suspend the thread without waiting */
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THR_THREAD_LOCK(curthread, thread);
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ret = suspend_common(curthread, thread, 0);
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if (ret == 0) {
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/* Can not suspend, try to wait */
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thread->refcount++;
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THREAD_LIST_UNLOCK(curthread);
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suspend_common(curthread, thread, 1);
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THR_THREAD_UNLOCK(curthread, thread);
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THREAD_LIST_LOCK(curthread);
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_thr_ref_delete_unlocked(curthread, thread);
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/*
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* Because we were blocked, things may have
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* been changed, we have to restart the
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* process.
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*/
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goto restart;
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}
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THR_THREAD_UNLOCK(curthread, thread);
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}
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}
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THREAD_LIST_UNLOCK(curthread);
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}
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static int
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suspend_common(struct pthread *curthread, struct pthread *thread,
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int waitok)
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{
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umtx_t tmp;
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while (thread->state != PS_DEAD &&
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!(thread->flags & THR_FLAGS_SUSPENDED)) {
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thread->flags |= THR_FLAGS_NEED_SUSPEND;
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THR_THREAD_UNLOCK(curthread, thread);
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_thr_send_sig(thread, SIGCANCEL);
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if (waitok) {
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tmp = thread->cycle;
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_thr_umtx_wait(&thread->cycle, tmp, NULL);
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THR_THREAD_LOCK(curthread, thread);
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} else {
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THR_THREAD_LOCK(curthread, thread);
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return (0);
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}
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}
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return (1);
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}
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