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. 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: releng/10.2/lib/libkse/thread/thr_resume_np.c 174689 2007-12-16 23:29:57Z deischen $ 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_resume_np(pthread_t thread); 39void _pthread_resume_all_np(void); 40 41static struct kse_mailbox *resume_common(struct pthread *); 42 43__weak_reference(_pthread_resume_np, pthread_resume_np); 44__weak_reference(_pthread_resume_all_np, pthread_resume_all_np); 45 46 47/* Resume a thread: */ 48int 49_pthread_resume_np(pthread_t thread) 50{ 51 struct pthread *curthread = _get_curthread(); 52 struct kse_mailbox *kmbx; 53 int ret; 54 55 /* Add a reference to the thread: */ 56 if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) { 57 /* Lock the threads scheduling queue: */ 58 THR_SCHED_LOCK(curthread, thread); 59 kmbx = resume_common(thread); 60 THR_SCHED_UNLOCK(curthread, thread); 61 _thr_ref_delete(curthread, thread); 62 if (kmbx != NULL) 63 kse_wakeup(kmbx); 64 } 65 return (ret); 66} 67 68void 69_pthread_resume_all_np(void) 70{ 71 struct pthread *curthread = _get_curthread(); 72 struct pthread *thread; 73 struct kse_mailbox *kmbx; 74 kse_critical_t crit; 75 76 /* Take the thread list lock: */ 77 crit = _kse_critical_enter(); 78 KSE_LOCK_ACQUIRE(curthread->kse, &_thread_list_lock); 79 80 TAILQ_FOREACH(thread, &_thread_list, tle) { 81 if (thread != curthread) { 82 THR_SCHED_LOCK(curthread, thread); 83 kmbx = resume_common(thread); 84 THR_SCHED_UNLOCK(curthread, thread); 85 if (kmbx != NULL) 86 kse_wakeup(kmbx); 87 } 88 } 89 90 /* Release the thread list lock: */ 91 KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock); 92 _kse_critical_leave(crit); 93} 94 95static struct kse_mailbox * 96resume_common(struct pthread *thread) 97{ 98 /* Clear the suspend flag: */ 99 thread->flags &= ~THR_FLAGS_SUSPENDED; 100 101 /* 102 * If the thread's state is suspended, that means it is 103 * now runnable but not in any scheduling queue. Set the 104 * state to running and insert it into the run queue. 105 */ 106 if (thread->state == PS_SUSPENDED) 107 return (_thr_setrunnable_unlocked(thread)); 108 else 109 return (NULL); 110} 111