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