thr_exit.c revision 211409
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: head/lib/libthr/thread/thr_exit.c 211409 2010-08-17 02:50:12Z davidxu $ 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 42void _pthread_exit(void *status); 43 44__weak_reference(_pthread_exit, pthread_exit); 45 46void 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 */ 63void 64_thr_exit_cleanup(void) 65{ 66} 67 68void 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 curthread->cancel_enable = 0; 85 curthread->cancel_async = 0; 86 87 _thr_exit_cleanup(); 88 89 /* Save the return value: */ 90 curthread->ret = status; 91 while (curthread->cleanup != NULL) { 92 _pthread_cleanup_pop(1); 93 } 94 95 /* Check if there is thread specific data: */ 96 if (curthread->specific != NULL) { 97 /* Run the thread-specific data destructors: */ 98 _thread_cleanupspecific(); 99 } 100 101 if (!_thr_isthreaded()) 102 exit(0); 103 104 THREAD_LIST_LOCK(curthread); 105 _thread_active_threads--; 106 if (_thread_active_threads == 0) { 107 THREAD_LIST_UNLOCK(curthread); 108 exit(0); 109 /* Never reach! */ 110 } 111 THREAD_LIST_UNLOCK(curthread); 112 113 /* Tell malloc that the thread is exiting. */ 114 _malloc_thread_cleanup(); 115 116 THREAD_LIST_LOCK(curthread); 117 THR_LOCK(curthread); 118 curthread->state = PS_DEAD; 119 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { 120 curthread->cycle++; 121 _thr_umtx_wake(&curthread->cycle, INT_MAX, 0); 122 } 123 THR_UNLOCK(curthread); 124 /* 125 * Thread was created with initial refcount 1, we drop the 126 * reference count to allow it to be garbage collected. 127 */ 128 curthread->refcount--; 129 if (curthread->tlflags & TLFLAGS_DETACHED) 130 THR_GCLIST_ADD(curthread); 131 THREAD_LIST_UNLOCK(curthread); 132 if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 133 _thr_report_death(curthread); 134 135 /* 136 * Kernel will do wakeup at the address, so joiner thread 137 * will be resumed if it is sleeping at the address. 138 */ 139 thr_exit(&curthread->tid); 140 PANIC("thr_exit() returned"); 141 /* Never reach! */ 142} 143