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/*
* 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
}
}
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