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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $DragonFly: src/lib/libthread_xu/thread/thr_join.c,v 1.7 2006/04/06 13:03:09 davidxu Exp $ 33 */ 34 35 #include "namespace.h" 36 #include <machine/tls.h> 37 38 #include <errno.h> 39 #include <pthread.h> 40 #include "un-namespace.h" 41 42 #include "thr_private.h" 43 44 int _pthread_timedjoin_np(pthread_t pthread, void **thread_return, 45 const struct timespec *abstime); 46 47 static int join_common(pthread_t, void **, const struct timespec *); 48 49 static void backout_join(void *arg) 50 { 51 struct pthread *curthread = tls_get_curthread(); 52 struct pthread *pthread = (struct pthread *)arg; 53 54 THREAD_LIST_LOCK(curthread); 55 pthread->joiner = NULL; 56 THREAD_LIST_UNLOCK(curthread); 57 } 58 59 int 60 _pthread_join(pthread_t pthread, void **thread_return) 61 { 62 return (join_common(pthread, thread_return, NULL)); 63 } 64 65 int 66 _pthread_timedjoin_np(pthread_t pthread, void **thread_return, 67 const struct timespec *abstime) 68 { 69 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 || 70 abstime->tv_nsec >= 1000000000) 71 return (EINVAL); 72 73 return (join_common(pthread, thread_return, abstime)); 74 } 75 76 static int 77 join_common(pthread_t pthread, void **thread_return, 78 const struct timespec *abstime) 79 { 80 struct pthread *curthread = tls_get_curthread(); 81 struct timespec ts, ts2, *tsp; 82 void *tmp; 83 long state; 84 int oldcancel; 85 int ret = 0; 86 87 if (pthread == NULL) 88 return (EINVAL); 89 90 if (pthread == curthread) 91 return (EDEADLK); 92 93 THREAD_LIST_LOCK(curthread); 94 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) { 95 ret = ESRCH; 96 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) { 97 ret = ESRCH; 98 } else if (pthread->joiner != NULL) { 99 /* Multiple joiners are not supported. */ 100 ret = ENOTSUP; 101 } 102 if (ret) { 103 THREAD_LIST_UNLOCK(curthread); 104 return (ret); 105 } 106 /* Set the running thread to be the joiner: */ 107 pthread->joiner = curthread; 108 109 THREAD_LIST_UNLOCK(curthread); 110 111 THR_CLEANUP_PUSH(curthread, backout_join, pthread); 112 oldcancel = _thr_cancel_enter(curthread); 113 114 while ((state = pthread->state) != PS_DEAD) { 115 if (abstime != NULL) { 116 clock_gettime(CLOCK_REALTIME, &ts); 117 TIMESPEC_SUB(&ts2, abstime, &ts); 118 if (ts2.tv_sec < 0) { 119 ret = ETIMEDOUT; 120 break; 121 } 122 tsp = &ts2; 123 } else 124 tsp = NULL; 125 ret = _thr_umtx_wait(&pthread->state, state, tsp, 126 CLOCK_REALTIME); 127 if (ret == ETIMEDOUT) 128 break; 129 } 130 131 _thr_cancel_leave(curthread, oldcancel); 132 THR_CLEANUP_POP(curthread, 0); 133 134 if (ret == ETIMEDOUT) { 135 THREAD_LIST_LOCK(curthread); 136 pthread->joiner = NULL; 137 THREAD_LIST_UNLOCK(curthread); 138 } else { 139 ret = 0; 140 tmp = pthread->ret; 141 THREAD_LIST_LOCK(curthread); 142 pthread->tlflags |= TLFLAGS_DETACHED; 143 pthread->joiner = NULL; 144 THR_GCLIST_ADD(pthread); 145 THREAD_LIST_UNLOCK(curthread); 146 147 if (thread_return != NULL) 148 *thread_return = tmp; 149 } 150 return (ret); 151 } 152 153 __strong_reference(_pthread_join, pthread_join); 154 __strong_reference(_pthread_timedjoin_np, pthread_timedjoin_np); 155 156