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 "namespace.h" 33 #include <errno.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <pthread.h> 37 #include "un-namespace.h" 38 39 #include "thr_private.h" 40 41 void _pthread_exit(void *status); 42 43 __weak_reference(_pthread_exit, pthread_exit); 44 45 void 46 _thread_exit(const char *fname, int lineno, const char *msg) 47 { 48 49 /* Write an error message to the standard error file descriptor: */ 50 _thread_printf(2, 51 "Fatal error '%s' at line %d in file %s (errno = %d)\n", 52 msg, lineno, fname, errno); 53 54 abort(); 55 } 56 57 /* 58 * Only called when a thread is cancelled. It may be more useful 59 * to call it from pthread_exit() if other ways of asynchronous or 60 * abnormal thread termination can be found. 61 */ 62 void 63 _thr_exit_cleanup(void) 64 { 65 struct pthread *curthread = _get_curthread(); 66 67 /* 68 * POSIX states that cancellation/termination of a thread should 69 * not release any visible resources (such as mutexes) and that 70 * it is the applications responsibility. Resources that are 71 * internal to the threads library, including file and fd locks, 72 * are not visible to the application and need to be released. 73 */ 74 /* Unlock all private mutexes: */ 75 _mutex_unlock_private(curthread); 76 77 /* 78 * This still isn't quite correct because we don't account 79 * for held spinlocks (see libc/stdlib/malloc.c). 80 */ 81 } 82 83 void 84 _pthread_exit(void *status) 85 { 86 struct pthread *curthread = _get_curthread(); 87 88 /* Check if this thread is already in the process of exiting: */ 89 if (curthread->cancelling) { 90 char msg[128]; 91 snprintf(msg, sizeof(msg), "Thread %p has called " 92 "pthread_exit() from a destructor. POSIX 1003.1 " 93 "1996 s16.2.5.2 does not allow this!", curthread); 94 PANIC(msg); 95 } 96 97 /* Flag this thread as exiting. */ 98 curthread->cancelling = 1; 99 100 _thr_exit_cleanup(); 101 102 /* Save the return value: */ 103 curthread->ret = status; 104 while (curthread->cleanup != NULL) { 105 _pthread_cleanup_pop(1); 106 } 107 108 /* Check if there is thread specific data: */ 109 if (curthread->specific != NULL) { 110 /* Run the thread-specific data destructors: */ 111 _thread_cleanupspecific(); 112 } 113 114 if (!_thr_isthreaded()) 115 exit(0); 116 117 THREAD_LIST_LOCK(curthread); 118 _thread_active_threads--; 119 if (_thread_active_threads == 0) { 120 THREAD_LIST_UNLOCK(curthread); 121 exit(0); 122 /* Never reach! */ 123 } 124 THR_LOCK(curthread); 125 curthread->state = PS_DEAD; 126 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { 127 curthread->cycle++; 128 _thr_umtx_wake(&curthread->cycle, INT_MAX); 129 } 130 THR_UNLOCK(curthread); 131 /* 132 * Thread was created with initial refcount 1, we drop the 133 * reference count to allow it to be garbage collected. 134 */ 135 curthread->refcount--; 136 if (curthread->tlflags & TLFLAGS_DETACHED) 137 THR_GCLIST_ADD(curthread); 138 THREAD_LIST_UNLOCK(curthread); 139 if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 140 _thr_report_death(curthread); 141 142 /* 143 * Kernel will do wakeup at the address, so joiner thread 144 * will be resumed if it is sleeping at the address. 145 */ 146 thr_exit(&curthread->tid); 147 PANIC("thr_exit() returned"); 148 /* Never reach! */ 149 } 150