1 /* 2 * Copyright (c) 1995-1998 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 * $FreeBSD: src/lib/libpthread/thread/thr_exit.c,v 1.39 2004/10/23 23:37:54 davidxu Exp $ 33 * $DragonFly: src/lib/libthread_xu/thread/thr_exit.c,v 1.9 2007/03/13 00:19:29 corecode Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <machine/tls.h> 38 39 #include <errno.h> 40 #include <unistd.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <pthread.h> 46 #include "un-namespace.h" 47 48 #include "thr_private.h" 49 50 void 51 _thread_exit(const char *fname, int lineno, const char *msg) 52 { 53 54 /* Write an error message to the standard error file descriptor: */ 55 _thread_printf(2, 56 "Fatal error '%s' at line %d in file %s (errno = %d)\n", 57 msg, lineno, fname, errno); 58 59 abort(); 60 } 61 62 /* 63 * Only called when a thread is cancelled. It may be more useful 64 * to call it from pthread_exit() if other ways of asynchronous or 65 * abnormal thread termination can be found. 66 */ 67 void 68 _thr_exit_cleanup(void) 69 { 70 struct pthread *curthread = tls_get_curthread(); 71 72 /* 73 * POSIX states that cancellation/termination of a thread should 74 * not release any visible resources (such as mutexes) and that 75 * it is the applications responsibility. Resources that are 76 * internal to the threads library, including file and fd locks, 77 * are not visible to the application and need to be released. 78 */ 79 /* Unlock all private mutexes: */ 80 _mutex_unlock_private(curthread); 81 82 /* 83 * This still isn't quite correct because we don't account 84 * for held spinlocks (see libc/stdlib/malloc.c). 85 */ 86 } 87 88 void 89 _pthread_exit(void *status) 90 { 91 struct pthread *curthread = tls_get_curthread(); 92 93 /* Check if this thread is already in the process of exiting: */ 94 if ((curthread->cancelflags & THR_CANCEL_EXITING) != 0) { 95 char msg[128]; 96 snprintf(msg, sizeof(msg), "Thread %p has called " 97 "pthread_exit() from a destructor. POSIX 1003.1 " 98 "1996 s16.2.5.2 does not allow this!", curthread); 99 PANIC(msg); 100 } 101 102 /* Flag this thread as exiting. */ 103 atomic_set_int(&curthread->cancelflags, THR_CANCEL_EXITING); 104 105 _thr_exit_cleanup(); 106 107 /* Save the return value: */ 108 curthread->ret = status; 109 while (curthread->cleanup != NULL) { 110 _pthread_cleanup_pop(1); 111 } 112 113 /* Check if there is thread specific data: */ 114 if (curthread->specific != NULL) { 115 /* Run the thread-specific data destructors: */ 116 _thread_cleanupspecific(); 117 } 118 119 if (!_thr_isthreaded()) 120 exit(0); 121 122 THREAD_LIST_LOCK(curthread); 123 _thread_active_threads--; 124 if (_thread_active_threads == 0) { 125 THREAD_LIST_UNLOCK(curthread); 126 exit(0); 127 /* Never reach! */ 128 } 129 THR_LOCK(curthread); 130 curthread->state = PS_DEAD; 131 THR_UNLOCK(curthread); 132 curthread->refcount--; 133 if (curthread->tlflags & TLFLAGS_DETACHED) 134 THR_GCLIST_ADD(curthread); 135 THREAD_LIST_UNLOCK(curthread); 136 if (curthread->joiner) 137 _thr_umtx_wake(&curthread->state, INT_MAX); 138 if (SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 139 _thr_report_death(curthread); 140 /* Exit and set terminated to once we're really dead. */ 141 extexit(EXTEXIT_SETINT|EXTEXIT_LWP, 1, &curthread->terminated); 142 PANIC("thr_exit() returned"); 143 /* Never reach! */ 144 } 145 146 __strong_reference(_pthread_exit, pthread_exit); 147