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 } 66 67 void 68 _pthread_exit(void *status) 69 { 70 struct pthread *curthread = _get_curthread(); 71 72 /* Check if this thread is already in the process of exiting: */ 73 if (curthread->cancelling) { 74 char msg[128]; 75 snprintf(msg, sizeof(msg), "Thread %p has called " 76 "pthread_exit() from a destructor. POSIX 1003.1 " 77 "1996 s16.2.5.2 does not allow this!", curthread); 78 PANIC(msg); 79 } 80 81 /* Flag this thread as exiting. */ 82 curthread->cancelling = 1; 83 84 _thr_exit_cleanup(); 85 86 /* Save the return value: */ 87 curthread->ret = status; 88 while (curthread->cleanup != NULL) { 89 _pthread_cleanup_pop(1); 90 } 91 92 /* Check if there is thread specific data: */ 93 if (curthread->specific != NULL) { 94 /* Run the thread-specific data destructors: */ 95 _thread_cleanupspecific(); 96 } 97 98 if (!_thr_isthreaded()) 99 exit(0); 100 101 THREAD_LIST_LOCK(curthread); 102 _thread_active_threads--; 103 if (_thread_active_threads == 0) { 104 THREAD_LIST_UNLOCK(curthread); 105 exit(0); 106 /* Never reach! */ 107 } 108 THR_LOCK(curthread); 109 curthread->state = PS_DEAD; 110 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { 111 curthread->cycle++; 112 _thr_umtx_wake(&curthread->cycle, INT_MAX, 0); 113 } 114 THR_UNLOCK(curthread); 115 /* 116 * Thread was created with initial refcount 1, we drop the 117 * reference count to allow it to be garbage collected. 118 */ 119 curthread->refcount--; 120 if (curthread->tlflags & TLFLAGS_DETACHED) 121 THR_GCLIST_ADD(curthread); 122 THREAD_LIST_UNLOCK(curthread); 123 if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 124 _thr_report_death(curthread); 125 126 /* 127 * Kernel will do wakeup at the address, so joiner thread 128 * will be resumed if it is sleeping at the address. 129 */ 130 thr_exit(&curthread->tid); 131 PANIC("thr_exit() returned"); 132 /* Never reach! */ 133 } 134