1 /* 2 * Copyright (c) 1995 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: src/lib/libpthread/thread/thr_resume_np.c,v 1.18 2003/07/23 02:11:07 deischen Exp $ 33 * $DragonFly: src/lib/libthread_xu/thread/thr_resume_np.c,v 1.2 2005/03/29 19:26:20 joerg Exp $ 34 */ 35 36 #include <machine/tls.h> 37 38 #include <errno.h> 39 #include <pthread.h> 40 #include "thr_private.h" 41 42 __weak_reference(_pthread_resume_np, pthread_resume_np); 43 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np); 44 45 static void resume_common(struct pthread *thread); 46 47 /* Resume a thread: */ 48 int 49 _pthread_resume_np(pthread_t thread) 50 { 51 struct pthread *curthread = tls_get_curthread(); 52 int ret; 53 54 /* Add a reference to the thread: */ 55 if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) { 56 /* Lock the threads scheduling queue: */ 57 THR_THREAD_LOCK(curthread, thread); 58 resume_common(thread); 59 THR_THREAD_UNLOCK(curthread, thread); 60 _thr_ref_delete(curthread, thread); 61 } 62 return (ret); 63 } 64 65 void 66 _pthread_resume_all_np(void) 67 { 68 struct pthread *curthread = tls_get_curthread(); 69 struct pthread *thread; 70 71 /* Take the thread list lock: */ 72 THREAD_LIST_LOCK(curthread); 73 74 TAILQ_FOREACH(thread, &_thread_list, tle) { 75 if (thread != curthread) { 76 THR_THREAD_LOCK(curthread, thread); 77 resume_common(thread); 78 THR_THREAD_UNLOCK(curthread, thread); 79 } 80 } 81 82 /* Release the thread list lock: */ 83 THREAD_LIST_UNLOCK(curthread); 84 } 85 86 static void 87 resume_common(struct pthread *thread) 88 { 89 /* Clear the suspend flag: */ 90 thread->flags &= ~THR_FLAGS_NEED_SUSPEND; 91 thread->cycle++; 92 _thr_umtx_wake(&thread->cycle, 1); 93 _thr_send_sig(thread, SIGCANCEL); 94 } 95