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freebsd/lib/libkse/thread/thr_resume_np.c
Daniel Eischen 40791d9d15 Fix suspend and resume.
Submitted (in part) by:	Kazuaki Oda <kaakun@highway.ne.jp>
2003-05-04 16:17:01 +00:00

100 lines
3.3 KiB
C

/*
* Copyright (c) 1995 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 resume_common(struct pthread *);
__weak_reference(_pthread_resume_np, pthread_resume_np);
__weak_reference(_pthread_resume_all_np, pthread_resume_all_np);
/* Resume a thread: */
int
_pthread_resume_np(pthread_t thread)
{
struct pthread *curthread = _get_curthread();
int ret;
/* Add a reference to the thread: */
if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) {
/* Lock the threads scheduling queue: */
THR_SCHED_LOCK(curthread, thread);
resume_common(thread);
THR_SCHED_UNLOCK(curthread, thread);
_thr_ref_delete(curthread, thread);
}
return (ret);
}
void
_pthread_resume_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);
resume_common(thread);
THR_SCHED_UNLOCK(curthread, thread);
}
}
/* Release the thread list lock: */
KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock);
_kse_critical_leave(crit);
}
static void
resume_common(struct pthread *thread)
{
/* Clear the suspend flag: */
thread->flags &= ~THR_FLAGS_SUSPENDED;
/*
* If the thread's state is suspended, that means it is
* now runnable but not in any scheduling queue. Set the
* state to running and insert it into the run queue.
*/
if (thread->state == PS_SUSPENDED)
_thr_setrunnable_unlocked(thread);
}