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 <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "namespace.h" 36 #include <errno.h> 37 #include <pthread.h> 38 #include <pthread_np.h> 39 #include "un-namespace.h" 40 41 #include "thr_private.h" 42 43 __weak_reference(_pthread_resume_np, pthread_resume_np); 44 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np); 45 46 static void resume_common(struct pthread *thread); 47 48 /* Resume a thread: */ 49 int 50 _pthread_resume_np(pthread_t thread) 51 { 52 struct pthread *curthread = _get_curthread(); 53 int ret; 54 55 /* Add a reference to the thread: */ 56 if ((ret = _thr_find_thread(curthread, thread, /*include dead*/0)) == 0) { 57 /* Lock the threads scheduling queue: */ 58 resume_common(thread); 59 THR_THREAD_UNLOCK(curthread, thread); 60 } 61 return (ret); 62 } 63 64 void 65 _pthread_resume_all_np(void) 66 { 67 struct pthread *curthread = _get_curthread(); 68 struct pthread *thread; 69 int old_nocancel; 70 71 old_nocancel = curthread->no_cancel; 72 curthread->no_cancel = 1; 73 _thr_suspend_all_lock(curthread); 74 /* Take the thread list lock: */ 75 THREAD_LIST_RDLOCK(curthread); 76 77 TAILQ_FOREACH(thread, &_thread_list, tle) { 78 if (thread != curthread) { 79 THR_THREAD_LOCK(curthread, thread); 80 resume_common(thread); 81 THR_THREAD_UNLOCK(curthread, thread); 82 } 83 } 84 85 /* Release the thread list lock: */ 86 THREAD_LIST_UNLOCK(curthread); 87 _thr_suspend_all_unlock(curthread); 88 curthread->no_cancel = old_nocancel; 89 _thr_testcancel(curthread); 90 } 91 92 static void 93 resume_common(struct pthread *thread) 94 { 95 /* Clear the suspend flag: */ 96 thread->flags &= ~(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED); 97 thread->cycle++; 98 _thr_umtx_wake(&thread->cycle, 1, 0); 99 } 100