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109 lines
3.3 KiB
C
109 lines
3.3 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. 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 "pthread_private.h"
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static void 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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int ret;
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/* Find the thread in the list of active threads: */
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if ((ret = _find_thread(thread)) == 0) {
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/*
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* Defer signals to protect the scheduling queues
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* from access by the signal handler:
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*/
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_thread_kern_sig_defer();
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if ((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0)
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resume_common(thread);
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/*
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* Undefer and handle pending signals, yielding if
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* necessary:
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*/
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_thread_kern_sig_undefer();
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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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/*
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* Defer signals to protect the scheduling queues from access
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* by the signal handler:
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*/
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_thread_kern_sig_defer();
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TAILQ_FOREACH(thread, &_thread_list, tle) {
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if ((thread != curthread) &&
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((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0))
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resume_common(thread);
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}
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/*
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* Undefer and handle pending signals, yielding if necessary:
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*/
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_thread_kern_sig_undefer();
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}
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static void
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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 &= ~PTHREAD_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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PTHREAD_SET_STATE(thread, PS_RUNNING);
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if (thread->priority_mutex_count > 0)
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PTHREAD_PRIOQ_INSERT_HEAD(thread);
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else
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PTHREAD_PRIOQ_INSERT_TAIL(thread);
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}
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}
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