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 static int join_common(pthread_t, void **, const struct timespec *); 45 46 static void backout_join(void *arg) 47 { 48 struct pthread *curthread = tls_get_curthread(); 49 struct pthread *pthread = (struct pthread *)arg; 50 51 THREAD_LIST_LOCK(curthread); 52 pthread->joiner = NULL; 53 THREAD_LIST_UNLOCK(curthread); 54 } 55 56 int 57 _pthread_join(pthread_t pthread, void **thread_return) 58 { 59 return (join_common(pthread, thread_return, NULL)); 60 } 61 62 int 63 _pthread_timedjoin_np(pthread_t pthread, void **thread_return, 64 const struct timespec *abstime) 65 { 66 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 || 67 abstime->tv_nsec >= 1000000000) 68 return (EINVAL); 69 70 return (join_common(pthread, thread_return, abstime)); 71 } 72 73 static int 74 join_common(pthread_t pthread, void **thread_return, 75 const struct timespec *abstime) 76 { 77 struct pthread *curthread = tls_get_curthread(); 78 struct timespec ts, ts2, *tsp; 79 void *tmp; 80 long state; 81 int oldcancel; 82 int ret = 0; 83 84 if (pthread == NULL) 85 return (EINVAL); 86 87 if (pthread == curthread) 88 return (EDEADLK); 89 90 THREAD_LIST_LOCK(curthread); 91 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) { 92 ret = ESRCH; 93 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) { 94 ret = ESRCH; 95 } else if (pthread->joiner != NULL) { 96 /* Multiple joiners are not supported. */ 97 ret = ENOTSUP; 98 } 99 if (ret) { 100 THREAD_LIST_UNLOCK(curthread); 101 return (ret); 102 } 103 /* Set the running thread to be the joiner: */ 104 pthread->joiner = curthread; 105 106 THREAD_LIST_UNLOCK(curthread); 107 108 THR_CLEANUP_PUSH(curthread, backout_join, pthread); 109 oldcancel = _thr_cancel_enter(curthread); 110 111 while ((state = pthread->state) != PS_DEAD) { 112 if (abstime != NULL) { 113 clock_gettime(CLOCK_REALTIME, &ts); 114 TIMESPEC_SUB(&ts2, abstime, &ts); 115 if (ts2.tv_sec < 0) { 116 ret = ETIMEDOUT; 117 break; 118 } 119 tsp = &ts2; 120 } else 121 tsp = NULL; 122 ret = _thr_umtx_wait(&pthread->state, state, tsp, 123 CLOCK_REALTIME); 124 if (ret == ETIMEDOUT) 125 break; 126 } 127 128 _thr_cancel_leave(curthread, oldcancel); 129 THR_CLEANUP_POP(curthread, 0); 130 131 if (ret == ETIMEDOUT) { 132 THREAD_LIST_LOCK(curthread); 133 pthread->joiner = NULL; 134 THREAD_LIST_UNLOCK(curthread); 135 } else { 136 ret = 0; 137 tmp = pthread->ret; 138 THREAD_LIST_LOCK(curthread); 139 pthread->tlflags |= TLFLAGS_DETACHED; 140 pthread->joiner = NULL; 141 THR_GCLIST_ADD(pthread); 142 THREAD_LIST_UNLOCK(curthread); 143 144 if (thread_return != NULL) 145 *thread_return = tmp; 146 } 147 return (ret); 148 } 149 150 __strong_reference(_pthread_join, pthread_join); 151 __strong_reference(_pthread_timedjoin_np, pthread_timedjoin_np); 152 153