cc24e83605
This eliminates ping-ponging of locks, where the idle KSE wakes up only to find the lock it needs is being held. This gives little or no gain to M:N mode but greatly speeds up 1:1 mode. Reviewed & Tested by: davidxu
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/*
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* Copyright (c) 1995 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 struct kse_mailbox *resume_common(struct pthread *);
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__weak_reference(_pthread_resume_np, pthread_resume_np);
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__weak_reference(_pthread_resume_all_np, pthread_resume_all_np);
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/* Resume a thread: */
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int
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_pthread_resume_np(pthread_t thread)
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{
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struct pthread *curthread = _get_curthread();
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struct kse_mailbox *kmbx;
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int ret;
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/* Add a reference to the thread: */
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if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) {
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/* Lock the threads scheduling queue: */
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THR_SCHED_LOCK(curthread, thread);
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kmbx = resume_common(thread);
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THR_SCHED_UNLOCK(curthread, thread);
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_thr_ref_delete(curthread, thread);
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if (kmbx != NULL)
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kse_wakeup(kmbx);
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}
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return (ret);
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}
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void
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_pthread_resume_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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struct kse_mailbox *kmbx;
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kse_critical_t crit;
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/* Take the thread list lock: */
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crit = _kse_critical_enter();
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KSE_LOCK_ACQUIRE(curthread->kse, &_thread_list_lock);
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TAILQ_FOREACH(thread, &_thread_list, tle) {
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if (thread != curthread) {
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THR_SCHED_LOCK(curthread, thread);
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kmbx = resume_common(thread);
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THR_SCHED_UNLOCK(curthread, thread);
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if (kmbx != NULL)
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kse_wakeup(kmbx);
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}
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}
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/* Release the thread list lock: */
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KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock);
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_kse_critical_leave(crit);
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}
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static struct kse_mailbox *
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resume_common(struct pthread *thread)
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{
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/* Clear the suspend flag: */
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thread->flags &= ~THR_FLAGS_SUSPENDED;
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/*
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* If the thread's state is suspended, that means it is
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* now runnable but not in any scheduling queue. Set the
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* state to running and insert it into the run queue.
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*/
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if (thread->state == PS_SUSPENDED)
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return (_thr_setrunnable_unlocked(thread));
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else
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return (NULL);
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}
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