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 oldcancel; 80 int ret = 0; 81 82 if (pthread == NULL) 83 return (EINVAL); 84 85 if (pthread == curthread) 86 return (EDEADLK); 87 88 THREAD_LIST_LOCK(curthread); 89 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) { 90 ret = ESRCH; 91 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) { 92 ret = ESRCH; 93 } else if (pthread->joiner != NULL) { 94 /* Multiple joiners are not supported. */ 95 ret = ENOTSUP; 96 } 97 if (ret) { 98 THREAD_LIST_UNLOCK(curthread); 99 return (ret); 100 } 101 /* Set the running thread to be the joiner: */ 102 pthread->joiner = curthread; 103 104 THREAD_LIST_UNLOCK(curthread); 105 106 THR_CLEANUP_PUSH(curthread, backout_join, pthread); 107 oldcancel = _thr_cancel_enter(curthread); 108 109 tid = pthread->tid; 110 while (pthread->tid != TID_TERMINATED) { 111 if (abstime != NULL) { 112 clock_gettime(CLOCK_REALTIME, &ts); 113 TIMESPEC_SUB(&ts2, abstime, &ts); 114 if (ts2.tv_sec < 0) { 115 ret = ETIMEDOUT; 116 break; 117 } 118 tsp = &ts2; 119 } else 120 tsp = NULL; 121 ret = _thr_umtx_wait(&pthread->tid, tid, tsp); 122 if (ret == ETIMEDOUT) 123 break; 124 } 125 126 _thr_cancel_leave(curthread, oldcancel); 127 THR_CLEANUP_POP(curthread, 0); 128 129 if (ret == ETIMEDOUT) { 130 THREAD_LIST_LOCK(curthread); 131 pthread->joiner = NULL; 132 THREAD_LIST_UNLOCK(curthread); 133 } else { 134 ret = 0; 135 tmp = pthread->ret; 136 THREAD_LIST_LOCK(curthread); 137 pthread->tlflags |= TLFLAGS_DETACHED; 138 pthread->joiner = NULL; 139 THR_GCLIST_ADD(pthread); 140 THREAD_LIST_UNLOCK(curthread); 141 142 if (thread_return != NULL) 143 *thread_return = tmp; 144 } 145 return (ret); 146 } 147