1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the author nor the names of any co-contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "namespace.h" 33 #include <errno.h> 34 #include <pthread.h> 35 #include <pthread_np.h> 36 #include "un-namespace.h" 37 38 #include "thr_private.h" 39 40 __weak_reference(_pthread_resume_np, pthread_resume_np); 41 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np); 42 43 static void resume_common(struct pthread *thread); 44 45 /* Resume a thread: */ 46 int 47 _pthread_resume_np(pthread_t thread) 48 { 49 struct pthread *curthread = _get_curthread(); 50 int ret; 51 52 /* Add a reference to the thread: */ 53 if ((ret = _thr_find_thread(curthread, thread, /*include dead*/0)) == 0) { 54 /* Lock the threads scheduling queue: */ 55 resume_common(thread); 56 THR_THREAD_UNLOCK(curthread, thread); 57 } 58 return (ret); 59 } 60 61 void 62 _pthread_resume_all_np(void) 63 { 64 struct pthread *curthread = _get_curthread(); 65 struct pthread *thread; 66 int old_nocancel; 67 68 old_nocancel = curthread->no_cancel; 69 curthread->no_cancel = 1; 70 _thr_suspend_all_lock(curthread); 71 /* Take the thread list lock: */ 72 THREAD_LIST_RDLOCK(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 _thr_suspend_all_unlock(curthread); 85 curthread->no_cancel = old_nocancel; 86 _thr_testcancel(curthread); 87 } 88 89 static void 90 resume_common(struct pthread *thread) 91 { 92 /* Clear the suspend flag: */ 93 thread->flags &= ~(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED); 94 thread->cycle++; 95 _thr_umtx_wake(&thread->cycle, 1, 0); 96 } 97