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 * $FreeBSD$ 30 */ 31#include "namespace.h" 32#include <sys/types.h> 33#include <machine/atomic.h> 34#include <errno.h> 35#include <pthread.h> 36#include "un-namespace.h" 37#include "thr_private.h" 38 39__weak_reference(_pthread_detach, pthread_detach); 40 41int 42_pthread_detach(pthread_t pthread) 43{ 44 struct pthread *curthread = _get_curthread(); 45 struct kse_mailbox *kmbx = NULL; 46 struct pthread *joiner; 47 int rval = 0; 48 49 /* Check for invalid calling parameters: */ 50 if (pthread == NULL || pthread->magic != THR_MAGIC) 51 /* Return an invalid argument error: */ 52 rval = EINVAL; 53 54 else if ((rval = _thr_ref_add(curthread, pthread, 55 /*include dead*/1)) != 0) { 56 /* Return an error: */ 57 } 58 59 /* Check if the thread is already detached: */ 60 else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) { 61 /* Return an error: */ 62 _thr_ref_delete(curthread, pthread); 63 rval = EINVAL; 64 } else { 65 /* Lock the detached thread: */ 66 THR_SCHED_LOCK(curthread, pthread); 67 68 /* Flag the thread as detached: */ 69 pthread->attr.flags |= PTHREAD_DETACHED; 70 71 /* Retrieve any joining thread and remove it: */ 72 joiner = pthread->joiner; 73 if ((joiner != NULL) && (joiner->kseg == pthread->kseg)) { 74 /* 75 * We already own the scheduler lock for the joiner. 76 * Take advantage of that and make the joiner runnable. 77 */ 78 if (joiner->join_status.thread == pthread) { 79 /* 80 * Set the return value for the woken thread: 81 */ 82 joiner->join_status.error = ESRCH; 83 joiner->join_status.ret = NULL; 84 joiner->join_status.thread = NULL; 85 86 kmbx = _thr_setrunnable_unlocked(joiner); 87 } 88 joiner = NULL; 89 } 90 THR_SCHED_UNLOCK(curthread, pthread); 91 /* See if there is a thread waiting in pthread_join(): */ 92 if ((joiner != NULL) && 93 (_thr_ref_add(curthread, joiner, 0) == 0)) { 94 /* Lock the joiner before fiddling with it. */ 95 THR_SCHED_LOCK(curthread, joiner); 96 if (joiner->join_status.thread == pthread) { 97 /* 98 * Set the return value for the woken thread: 99 */ 100 joiner->join_status.error = ESRCH; 101 joiner->join_status.ret = NULL; 102 joiner->join_status.thread = NULL; 103 104 kmbx = _thr_setrunnable_unlocked(joiner); 105 } 106 THR_SCHED_UNLOCK(curthread, joiner); 107 _thr_ref_delete(curthread, joiner); 108 } 109 _thr_ref_delete(curthread, pthread); 110 if (kmbx != NULL) 111 kse_wakeup(kmbx); 112 } 113 114 /* Return the completion status: */ 115 return (rval); 116} 117