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