1bb535300SJeff Roberson /* 2bb535300SJeff Roberson * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>. 3bb535300SJeff Roberson * All rights reserved. 4bb535300SJeff Roberson * 5bb535300SJeff Roberson * Redistribution and use in source and binary forms, with or without 6bb535300SJeff Roberson * modification, are permitted provided that the following conditions 7bb535300SJeff Roberson * are met: 8bb535300SJeff Roberson * 1. Redistributions of source code must retain the above copyright 9bb535300SJeff Roberson * notice, this list of conditions and the following disclaimer. 10bb535300SJeff Roberson * 2. Redistributions in binary form must reproduce the above copyright 11bb535300SJeff Roberson * notice, this list of conditions and the following disclaimer in the 12bb535300SJeff Roberson * documentation and/or other materials provided with the distribution. 13bb535300SJeff Roberson * 3. All advertising materials mentioning features or use of this software 14bb535300SJeff Roberson * must display the following acknowledgement: 15bb535300SJeff Roberson * This product includes software developed by John Birrell. 16bb535300SJeff Roberson * 4. Neither the name of the author nor the names of any co-contributors 17bb535300SJeff Roberson * may be used to endorse or promote products derived from this software 18bb535300SJeff Roberson * without specific prior written permission. 19bb535300SJeff Roberson * 20bb535300SJeff Roberson * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21bb535300SJeff Roberson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22bb535300SJeff Roberson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23bb535300SJeff Roberson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24bb535300SJeff Roberson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25bb535300SJeff Roberson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26bb535300SJeff Roberson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27bb535300SJeff Roberson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28bb535300SJeff Roberson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29bb535300SJeff Roberson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30bb535300SJeff Roberson * SUCH DAMAGE. 31bb535300SJeff Roberson * 32bb535300SJeff Roberson * $FreeBSD$ 33bb535300SJeff Roberson */ 34a091d823SDavid Xu 35bb535300SJeff Roberson #include <errno.h> 36bb535300SJeff Roberson #include <pthread.h> 37a091d823SDavid Xu 38bb535300SJeff Roberson #include "thr_private.h" 39bb535300SJeff Roberson 40a091d823SDavid Xu static void suspend_common(struct pthread *thread); 41a091d823SDavid Xu 42bb535300SJeff Roberson __weak_reference(_pthread_suspend_np, pthread_suspend_np); 43bb535300SJeff Roberson __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np); 44bb535300SJeff Roberson 45bb535300SJeff Roberson /* Suspend a thread: */ 46bb535300SJeff Roberson int 47bb535300SJeff Roberson _pthread_suspend_np(pthread_t thread) 48bb535300SJeff Roberson { 49a091d823SDavid Xu struct pthread *curthread = _get_curthread(); 50a091d823SDavid Xu int ret; 51a091d823SDavid Xu 52a091d823SDavid Xu /* Suspending the current thread doesn't make sense. */ 53a091d823SDavid Xu if (thread == _get_curthread()) 54a091d823SDavid Xu ret = EDEADLK; 55a091d823SDavid Xu 56a091d823SDavid Xu /* Add a reference to the thread: */ 57a091d823SDavid Xu else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) 58a091d823SDavid Xu == 0) { 59a091d823SDavid Xu /* Lock the threads scheduling queue: */ 60a091d823SDavid Xu THR_THREAD_LOCK(curthread, thread); 61a091d823SDavid Xu suspend_common(thread); 62a091d823SDavid Xu /* Unlock the threads scheduling queue: */ 63a091d823SDavid Xu THR_THREAD_UNLOCK(curthread, thread); 64a091d823SDavid Xu 65a091d823SDavid Xu /* Don't forget to remove the reference: */ 66a091d823SDavid Xu _thr_ref_delete(curthread, thread); 67a091d823SDavid Xu } 68a091d823SDavid Xu return (ret); 69bb535300SJeff Roberson } 70bb535300SJeff Roberson 71bb535300SJeff Roberson void 72bb535300SJeff Roberson _pthread_suspend_all_np(void) 73bb535300SJeff Roberson { 74a091d823SDavid Xu struct pthread *curthread = _get_curthread(); 75a091d823SDavid Xu struct pthread *thread; 76a091d823SDavid Xu 77a091d823SDavid Xu /* Take the thread list lock: */ 78a091d823SDavid Xu THREAD_LIST_LOCK(curthread); 79a091d823SDavid Xu 80a091d823SDavid Xu TAILQ_FOREACH(thread, &_thread_list, tle) { 81a091d823SDavid Xu if (thread != curthread) { 82a091d823SDavid Xu THR_THREAD_LOCK(curthread, thread); 83a091d823SDavid Xu suspend_common(thread); 84a091d823SDavid Xu THR_THREAD_UNLOCK(curthread, thread); 85a091d823SDavid Xu } 86a091d823SDavid Xu } 87a091d823SDavid Xu 88a091d823SDavid Xu /* Release the thread list lock: */ 89a091d823SDavid Xu THREAD_LIST_UNLOCK(curthread); 90a091d823SDavid Xu } 91a091d823SDavid Xu 92a091d823SDavid Xu static void 93a091d823SDavid Xu suspend_common(struct pthread *thread) 94a091d823SDavid Xu { 95a091d823SDavid Xu if (thread->state != PS_DEAD) { 96a091d823SDavid Xu thread->flags |= THR_FLAGS_NEED_SUSPEND; 97a091d823SDavid Xu _thr_send_sig(thread, SIGCANCEL); 98a091d823SDavid Xu } 99bb535300SJeff Roberson } 100