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. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <errno.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <pthread.h> 36 37 #include "thr_private.h" 38 39 void _pthread_exit(void *status); 40 41 __weak_reference(_pthread_exit, pthread_exit); 42 43 void 44 _thread_exit(const char *fname, int lineno, const char *msg) 45 { 46 47 /* Write an error message to the standard error file descriptor: */ 48 _thread_printf(2, 49 "Fatal error '%s' at line %d in file %s (errno = %d)\n", 50 msg, lineno, fname, errno); 51 52 abort(); 53 } 54 55 /* 56 * Only called when a thread is cancelled. It may be more useful 57 * to call it from pthread_exit() if other ways of asynchronous or 58 * abnormal thread termination can be found. 59 */ 60 void 61 _thr_exit_cleanup(void) 62 { 63 struct pthread *curthread = _get_curthread(); 64 65 /* 66 * POSIX states that cancellation/termination of a thread should 67 * not release any visible resources (such as mutexes) and that 68 * it is the applications responsibility. Resources that are 69 * internal to the threads library, including file and fd locks, 70 * are not visible to the application and need to be released. 71 */ 72 /* Unlock all private mutexes: */ 73 _mutex_unlock_private(curthread); 74 75 /* 76 * This still isn't quite correct because we don't account 77 * for held spinlocks (see libc/stdlib/malloc.c). 78 */ 79 } 80 81 void 82 _pthread_exit(void *status) 83 { 84 struct pthread *curthread = _get_curthread(); 85 86 /* Check if this thread is already in the process of exiting: */ 87 if (curthread->cancelling) { 88 char msg[128]; 89 snprintf(msg, sizeof(msg), "Thread %p has called " 90 "pthread_exit() from a destructor. POSIX 1003.1 " 91 "1996 s16.2.5.2 does not allow this!", curthread); 92 PANIC(msg); 93 } 94 95 /* Flag this thread as exiting. */ 96 curthread->cancelling = 1; 97 98 _thr_exit_cleanup(); 99 100 /* Save the return value: */ 101 curthread->ret = status; 102 while (curthread->cleanup != NULL) { 103 pthread_cleanup_pop(1); 104 } 105 106 /* Check if there is thread specific data: */ 107 if (curthread->specific != NULL) { 108 /* Run the thread-specific data destructors: */ 109 _thread_cleanupspecific(); 110 } 111 112 if (!_thr_isthreaded()) 113 exit(0); 114 115 THREAD_LIST_LOCK(curthread); 116 _thread_active_threads--; 117 if (_thread_active_threads == 0) { 118 THREAD_LIST_UNLOCK(curthread); 119 exit(0); 120 /* Never reach! */ 121 } 122 THR_LOCK(curthread); 123 curthread->state = PS_DEAD; 124 THR_UNLOCK(curthread); 125 /* 126 * Thread was created with initial refcount 1, we drop the 127 * reference count to allow it to be garbage collected. 128 */ 129 curthread->refcount--; 130 if (curthread->tlflags & TLFLAGS_DETACHED) 131 THR_GCLIST_ADD(curthread); 132 THREAD_LIST_UNLOCK(curthread); 133 if (SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 134 _thr_report_death(curthread); 135 136 /* 137 * Kernel will do wakeup at the address, so joiner thread 138 * will be resumed if it is sleeping at the address. 139 */ 140 thr_exit(&curthread->tid); 141 PANIC("thr_exit() returned"); 142 /* Never reach! */ 143 } 144