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. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32#include "namespace.h" 33#include <errno.h> 34#include <pthread.h> 35#include "un-namespace.h" 36#include "thr_private.h" 37 38int _pthread_suspend_np(pthread_t thread); 39void _pthread_suspend_all_np(void); 40 41static void suspend_common(struct pthread *thread); 42 43__weak_reference(_pthread_suspend_np, pthread_suspend_np); 44__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np); 45 46/* Suspend a thread: */ 47int 48_pthread_suspend_np(pthread_t thread) 49{ 50 struct pthread *curthread = _get_curthread(); 51 int ret; 52 53 /* Suspending the current thread doesn't make sense. */ 54 if (thread == _get_curthread()) 55 ret = EDEADLK; 56 57 /* Add a reference to the thread: */ 58 else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) 59 == 0) { 60 /* Lock the threads scheduling queue: */ 61 THR_SCHED_LOCK(curthread, thread); 62 suspend_common(thread); 63 /* Unlock the threads scheduling queue: */ 64 THR_SCHED_UNLOCK(curthread, thread); 65 66 /* Don't forget to remove the reference: */ 67 _thr_ref_delete(curthread, thread); 68 } 69 return (ret); 70} 71 72void 73_pthread_suspend_all_np(void) 74{ 75 struct pthread *curthread = _get_curthread(); 76 struct pthread *thread; 77 kse_critical_t crit; 78 79 /* Take the thread list lock: */ 80 crit = _kse_critical_enter(); 81 KSE_LOCK_ACQUIRE(curthread->kse, &_thread_list_lock); 82 83 TAILQ_FOREACH(thread, &_thread_list, tle) { 84 if (thread != curthread) { 85 THR_SCHED_LOCK(curthread, thread); 86 suspend_common(thread); 87 THR_SCHED_UNLOCK(curthread, thread); 88 } 89 } 90 91 /* Release the thread list lock: */ 92 KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock); 93 _kse_critical_leave(crit); 94} 95 96void 97suspend_common(struct pthread *thread) 98{ 99 if ((thread->state != PS_DEAD) && 100 (thread->state != PS_DEADLOCK) && 101 ((thread->flags & THR_FLAGS_EXITING) == 0)) { 102 thread->flags |= THR_FLAGS_SUSPENDED; 103 if ((thread->flags & THR_FLAGS_IN_RUNQ) != 0) { 104 THR_RUNQ_REMOVE(thread); 105 THR_SET_STATE(thread, PS_SUSPENDED); 106 } 107#ifdef NOT_YET 108 if ((thread->attr.flags & PTHREAD_SCOPE_SYSTEM) != 0) 109 /* ??? */ 110#endif 111 } 112} 113