thr_exit.c revision 211836
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 211836 2010-08-26 09:04:27Z 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 58void 59_pthread_exit(void *status) 60{ 61 struct pthread *curthread = _get_curthread(); 62 63 /* Check if this thread is already in the process of exiting: */ 64 if (curthread->cancelling) { 65 char msg[128]; 66 snprintf(msg, sizeof(msg), "Thread %p has called " 67 "pthread_exit() from a destructor. POSIX 1003.1 " 68 "1996 s16.2.5.2 does not allow this!", curthread); 69 PANIC(msg); 70 } 71 72 /* Flag this thread as exiting. */ 73 curthread->cancelling = 1; 74 curthread->cancel_enable = 0; 75 curthread->cancel_async = 0; 76 77 /* Save the return value: */ 78 curthread->ret = status; 79 while (curthread->cleanup != NULL) { 80 _pthread_cleanup_pop(1); 81 } 82 83 /* Check if there is thread specific data: */ 84 if (curthread->specific != NULL) { 85 /* Run the thread-specific data destructors: */ 86 _thread_cleanupspecific(); 87 } 88 89 if (!_thr_isthreaded()) 90 exit(0); 91 92 THREAD_LIST_LOCK(curthread); 93 _thread_active_threads--; 94 if (_thread_active_threads == 0) { 95 THREAD_LIST_UNLOCK(curthread); 96 exit(0); 97 /* Never reach! */ 98 } 99 THREAD_LIST_UNLOCK(curthread); 100 101 /* Tell malloc that the thread is exiting. */ 102 _malloc_thread_cleanup(); 103 104 THREAD_LIST_LOCK(curthread); 105 THR_LOCK(curthread); 106 curthread->state = PS_DEAD; 107 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { 108 curthread->cycle++; 109 _thr_umtx_wake(&curthread->cycle, INT_MAX, 0); 110 } 111 THR_UNLOCK(curthread); 112 /* 113 * Thread was created with initial refcount 1, we drop the 114 * reference count to allow it to be garbage collected. 115 */ 116 curthread->refcount--; 117 if (curthread->tlflags & TLFLAGS_DETACHED) 118 THR_GCLIST_ADD(curthread); 119 THREAD_LIST_UNLOCK(curthread); 120 if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 121 _thr_report_death(curthread); 122 123 /* 124 * Kernel will do wakeup at the address, so joiner thread 125 * will be resumed if it is sleeping at the address. 126 */ 127 thr_exit(&curthread->tid); 128 PANIC("thr_exit() returned"); 129 /* Never reach! */ 130} 131