1 /* 2 * Copyright (c) 2005, David Xu <davidxu@freebsd.org> 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 30 #include "namespace.h" 31 #include <errno.h> 32 #include <pthread.h> 33 #include "un-namespace.h" 34 35 #include "thr_private.h" 36 37 int _pthread_timedjoin_np(pthread_t pthread, void **thread_return, 38 const struct timespec *abstime); 39 static int join_common(pthread_t, void **, const struct timespec *); 40 41 __weak_reference(_pthread_join, pthread_join); 42 __weak_reference(_pthread_timedjoin_np, pthread_timedjoin_np); 43 44 static void backout_join(void *arg) 45 { 46 struct pthread *curthread = _get_curthread(); 47 struct pthread *pthread = (struct pthread *)arg; 48 49 THREAD_LIST_LOCK(curthread); 50 pthread->joiner = NULL; 51 THREAD_LIST_UNLOCK(curthread); 52 } 53 54 int 55 _pthread_join(pthread_t pthread, void **thread_return) 56 { 57 return (join_common(pthread, thread_return, NULL)); 58 } 59 60 int 61 _pthread_timedjoin_np(pthread_t pthread, void **thread_return, 62 const struct timespec *abstime) 63 { 64 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 || 65 abstime->tv_nsec >= 1000000000) 66 return (EINVAL); 67 68 return (join_common(pthread, thread_return, abstime)); 69 } 70 71 static int 72 join_common(pthread_t pthread, void **thread_return, 73 const struct timespec *abstime) 74 { 75 struct pthread *curthread = _get_curthread(); 76 struct timespec ts, ts2, *tsp; 77 void *tmp; 78 long tid; 79 int ret = 0; 80 81 if (pthread == NULL) 82 return (EINVAL); 83 84 if (pthread == curthread) 85 return (EDEADLK); 86 87 THREAD_LIST_LOCK(curthread); 88 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) { 89 ret = ESRCH; 90 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) { 91 ret = EINVAL; 92 } else if (pthread->joiner != NULL) { 93 /* Multiple joiners are not supported. */ 94 ret = ENOTSUP; 95 } 96 if (ret) { 97 THREAD_LIST_UNLOCK(curthread); 98 return (ret); 99 } 100 /* Set the running thread to be the joiner: */ 101 pthread->joiner = curthread; 102 103 THREAD_LIST_UNLOCK(curthread); 104 105 THR_CLEANUP_PUSH(curthread, backout_join, pthread); 106 _thr_cancel_enter(curthread); 107 108 tid = pthread->tid; 109 while (pthread->tid != TID_TERMINATED) { 110 if (abstime != NULL) { 111 clock_gettime(CLOCK_REALTIME, &ts); 112 TIMESPEC_SUB(&ts2, abstime, &ts); 113 if (ts2.tv_sec < 0) { 114 ret = ETIMEDOUT; 115 break; 116 } 117 tsp = &ts2; 118 } else 119 tsp = NULL; 120 ret = _thr_umtx_wait(&pthread->tid, tid, tsp); 121 if (ret == ETIMEDOUT) 122 break; 123 } 124 125 _thr_cancel_leave(curthread); 126 THR_CLEANUP_POP(curthread, 0); 127 128 if (ret == ETIMEDOUT) { 129 THREAD_LIST_LOCK(curthread); 130 pthread->joiner = NULL; 131 THREAD_LIST_UNLOCK(curthread); 132 } else { 133 ret = 0; 134 tmp = pthread->ret; 135 THREAD_LIST_LOCK(curthread); 136 pthread->tlflags |= TLFLAGS_DETACHED; 137 pthread->joiner = NULL; 138 THR_GCLIST_ADD(pthread); 139 THREAD_LIST_UNLOCK(curthread); 140 141 if (thread_return != NULL) 142 *thread_return = tmp; 143 } 144 return (ret); 145 } 146