mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/*
|
|
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by John Birrell.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
|
|
#include "thr_private.h"
|
|
|
|
static int suspend_common(struct pthread *, struct pthread *,
|
|
int);
|
|
|
|
__weak_reference(_pthread_suspend_np, pthread_suspend_np);
|
|
__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
|
|
|
|
/* Suspend a thread: */
|
|
int
|
|
_pthread_suspend_np(pthread_t thread)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
int ret;
|
|
|
|
/* Suspending the current thread doesn't make sense. */
|
|
if (thread == _get_curthread())
|
|
ret = EDEADLK;
|
|
|
|
/* Add a reference to the thread: */
|
|
else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0))
|
|
== 0) {
|
|
/* Lock the threads scheduling queue: */
|
|
THR_THREAD_LOCK(curthread, thread);
|
|
suspend_common(curthread, thread, 1);
|
|
/* Unlock the threads scheduling queue: */
|
|
THR_THREAD_UNLOCK(curthread, thread);
|
|
|
|
/* Don't forget to remove the reference: */
|
|
_thr_ref_delete(curthread, thread);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
void
|
|
_pthread_suspend_all_np(void)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
struct pthread *thread;
|
|
int ret;
|
|
|
|
THREAD_LIST_LOCK(curthread);
|
|
|
|
TAILQ_FOREACH(thread, &_thread_list, tle) {
|
|
if (thread != curthread) {
|
|
THR_THREAD_LOCK(curthread, thread);
|
|
if (thread->state != PS_DEAD &&
|
|
!(thread->flags & THR_FLAGS_SUSPENDED))
|
|
thread->flags |= THR_FLAGS_NEED_SUSPEND;
|
|
THR_THREAD_UNLOCK(curthread, thread);
|
|
}
|
|
}
|
|
thr_kill(-1, SIGCANCEL);
|
|
|
|
restart:
|
|
TAILQ_FOREACH(thread, &_thread_list, tle) {
|
|
if (thread != curthread) {
|
|
/* First try to suspend the thread without waiting */
|
|
THR_THREAD_LOCK(curthread, thread);
|
|
ret = suspend_common(curthread, thread, 0);
|
|
if (ret == 0) {
|
|
/* Can not suspend, try to wait */
|
|
thread->refcount++;
|
|
THREAD_LIST_UNLOCK(curthread);
|
|
suspend_common(curthread, thread, 1);
|
|
THR_THREAD_UNLOCK(curthread, thread);
|
|
THREAD_LIST_LOCK(curthread);
|
|
_thr_ref_delete_unlocked(curthread, thread);
|
|
/*
|
|
* Because we were blocked, things may have
|
|
* been changed, we have to restart the
|
|
* process.
|
|
*/
|
|
goto restart;
|
|
}
|
|
THR_THREAD_UNLOCK(curthread, thread);
|
|
}
|
|
}
|
|
|
|
THREAD_LIST_UNLOCK(curthread);
|
|
}
|
|
|
|
static int
|
|
suspend_common(struct pthread *curthread, struct pthread *thread,
|
|
int waitok)
|
|
{
|
|
umtx_t tmp;
|
|
|
|
while (thread->state != PS_DEAD &&
|
|
!(thread->flags & THR_FLAGS_SUSPENDED)) {
|
|
thread->flags |= THR_FLAGS_NEED_SUSPEND;
|
|
THR_THREAD_UNLOCK(curthread, thread);
|
|
_thr_send_sig(thread, SIGCANCEL);
|
|
if (waitok) {
|
|
tmp = thread->cycle;
|
|
_thr_umtx_wait(&thread->cycle, tmp, NULL);
|
|
THR_THREAD_LOCK(curthread, thread);
|
|
} else {
|
|
THR_THREAD_LOCK(curthread, thread);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
return (1);
|
|
}
|