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