102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright (c) 1995-1998 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 suspend_common(struct pthread *thread);
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__weak_reference(_pthread_suspend_np, pthread_suspend_np);
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__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
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/* Suspend a thread: */
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int
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_pthread_suspend_np(pthread_t thread)
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{
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int ret;
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/* Suspending the current thread doesn't make sense. */
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if (thread == _get_curthread())
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ret = EDEADLK;
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/* Find the thread in the list of active threads: */
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else if ((ret = _find_thread(thread)) == 0) {
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/*
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* Defer signals to protect the scheduling queues from
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* access by the signal handler:
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*/
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_thread_kern_sig_defer();
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suspend_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_suspend_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
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* access 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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suspend_common(thread);
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}
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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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void
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suspend_common(struct pthread *thread)
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{
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thread->flags |= PTHREAD_FLAGS_SUSPENDED;
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if (thread->flags & PTHREAD_FLAGS_IN_PRIOQ) {
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PTHREAD_PRIOQ_REMOVE(thread);
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PTHREAD_SET_STATE(thread, PS_SUSPENDED);
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}
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}
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