thr_exit.c revision 212536
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 212536 2010-09-13 07:03:01Z 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 <sys/types.h> 38#include <sys/signalvar.h> 39#include "un-namespace.h" 40 41#include "libc_private.h" 42#include "thr_private.h" 43 44void _pthread_exit(void *status); 45 46__weak_reference(_pthread_exit, pthread_exit); 47 48void 49_thread_exit(const char *fname, int lineno, const char *msg) 50{ 51 52 /* Write an error message to the standard error file descriptor: */ 53 _thread_printf(2, 54 "Fatal error '%s' at line %d in file %s (errno = %d)\n", 55 msg, lineno, fname, errno); 56 57 abort(); 58} 59 60void 61_pthread_exit(void *status) 62{ 63 _pthread_exit_mask(status, NULL); 64} 65 66void 67_pthread_exit_mask(void *status, sigset_t *mask) 68{ 69 struct pthread *curthread = _get_curthread(); 70 71 /* Check if this thread is already in the process of exiting: */ 72 if (curthread->cancelling) { 73 char msg[128]; 74 snprintf(msg, sizeof(msg), "Thread %p has called " 75 "pthread_exit() from a destructor. POSIX 1003.1 " 76 "1996 s16.2.5.2 does not allow this!", curthread); 77 PANIC(msg); 78 } 79 80 /* Flag this thread as exiting. */ 81 curthread->cancelling = 1; 82 curthread->cancel_enable = 0; 83 curthread->cancel_async = 0; 84 curthread->cancel_point = 0; 85 if (mask != NULL) 86 __sys_sigprocmask(SIG_SETMASK, mask, NULL); 87 if (curthread->unblock_sigcancel) { 88 sigset_t set; 89 90 curthread->unblock_sigcancel = 0; 91 SIGEMPTYSET(set); 92 SIGADDSET(set, SIGCANCEL); 93 __sys_sigprocmask(SIG_UNBLOCK, mask, NULL); 94 } 95 96 /* Save the return value: */ 97 curthread->ret = status; 98 while (curthread->cleanup != NULL) { 99 _pthread_cleanup_pop(1); 100 } 101 102 /* Check if there is thread specific data: */ 103 if (curthread->specific != NULL) { 104 /* Run the thread-specific data destructors: */ 105 _thread_cleanupspecific(); 106 } 107 108 if (!_thr_isthreaded()) 109 exit(0); 110 111 if (atomic_fetchadd_int(&_thread_active_threads, -1) == 1) { 112 exit(0); 113 /* Never reach! */ 114 } 115 116 /* Tell malloc that the thread is exiting. */ 117 _malloc_thread_cleanup(); 118 119 THR_LOCK(curthread); 120 curthread->state = PS_DEAD; 121 if (curthread->flags & THR_FLAGS_NEED_SUSPEND) { 122 curthread->cycle++; 123 _thr_umtx_wake(&curthread->cycle, INT_MAX, 0); 124 } 125 /* 126 * Thread was created with initial refcount 1, we drop the 127 * reference count to allow it to be garbage collected. 128 */ 129 curthread->refcount--; 130 _thr_try_gc(curthread, curthread); /* thread lock released */ 131 132 if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH)) 133 _thr_report_death(curthread); 134 135#if defined(_PTHREADS_INVARIANTS) 136 if (THR_IN_CRITICAL(curthread)) 137 PANIC("thread exits with resources held!"); 138#endif 139 /* 140 * Kernel will do wakeup at the address, so joiner thread 141 * will be resumed if it is sleeping at the address. 142 */ 143 thr_exit(&curthread->tid); 144 PANIC("thr_exit() returned"); 145 /* Never reach! */ 146} 147