110 lines
3.6 KiB
C
110 lines
3.6 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 void suspend_common(struct pthread *thread);
|
|
|
|
__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_SCHED_LOCK(curthread, thread);
|
|
suspend_common(thread);
|
|
/* Unlock the threads scheduling queue: */
|
|
THR_SCHED_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;
|
|
kse_critical_t crit;
|
|
|
|
/* Take the thread list lock: */
|
|
crit = _kse_critical_enter();
|
|
KSE_LOCK_ACQUIRE(curthread->kse, &_thread_list_lock);
|
|
|
|
TAILQ_FOREACH(thread, &_thread_list, tle) {
|
|
if (thread != curthread) {
|
|
THR_SCHED_LOCK(curthread, thread);
|
|
suspend_common(thread);
|
|
THR_SCHED_UNLOCK(curthread, thread);
|
|
}
|
|
}
|
|
|
|
/* Release the thread list lock: */
|
|
KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock);
|
|
_kse_critical_leave(crit);
|
|
}
|
|
|
|
void
|
|
suspend_common(struct pthread *thread)
|
|
{
|
|
if ((thread->state != PS_DEAD) &&
|
|
(thread->state != PS_DEADLOCK) &&
|
|
((thread->flags & THR_FLAGS_EXITING) == 0)) {
|
|
thread->flags |= THR_FLAGS_SUSPENDED;
|
|
if ((thread->flags & THR_FLAGS_IN_RUNQ) != 0) {
|
|
THR_RUNQ_REMOVE(thread);
|
|
THR_SET_STATE(thread, PS_SUSPENDED);
|
|
}
|
|
#ifdef NOT_YET
|
|
if ((thread->attr.flags & PTHREAD_SCOPE_SYSTEM) != 0)
|
|
/* ??? */
|
|
#endif
|
|
}
|
|
}
|