2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * $FreeBSD: src/lib/libpthread/thread/thr_exit.c,v 1.39 2004/10/23 23:37:54 davidxu Exp $
32 #include "namespace.h"
33 #include <machine/tls.h>
41 #include "un-namespace.h"
43 #include "thr_private.h"
46 _thread_exit(const char *fname, int lineno, const char *msg)
49 /* Write an error message to the standard error file descriptor: */
51 "Fatal error '%s' at line %d in file %s (errno = %d)\n",
52 msg, lineno, fname, errno);
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.
63 _thr_exit_cleanup(void)
65 struct pthread *curthread = tls_get_curthread();
68 * POSIX states that cancellation/termination of a thread should
69 * not release any visible resources (such as mutexes) and that
70 * it is the applications responsibility. Resources that are
71 * internal to the threads library, including file and fd locks,
72 * are not visible to the application and need to be released.
74 /* Unlock all private mutexes: */
75 _mutex_unlock_private(curthread);
78 * This still isn't quite correct because we don't account
79 * for held spinlocks (see libc/stdlib/malloc.c).
84 _pthread_exit(void *status)
86 struct pthread *curthread = tls_get_curthread();
88 /* Check if this thread is already in the process of exiting: */
89 if ((curthread->cancelflags & THR_CANCEL_EXITING) != 0) {
91 snprintf(msg, sizeof(msg), "Thread %p has called "
92 "pthread_exit() from a destructor. POSIX 1003.1 "
93 "1996 s16.2.5.2 does not allow this!", curthread);
97 /* Flag this thread as exiting. */
98 atomic_set_int(&curthread->cancelflags, THR_CANCEL_EXITING);
102 /* Save the return value: */
103 curthread->ret = status;
104 while (curthread->cleanup != NULL) {
105 _pthread_cleanup_pop(1);
108 /* Check if there is thread specific data: */
109 if (curthread->specific != NULL) {
110 /* Run the thread-specific data destructors: */
111 _thread_cleanupspecific();
114 if (!_thr_isthreaded())
117 THREAD_LIST_LOCK(curthread);
118 _thread_active_threads--;
119 if (_thread_active_threads == 0) {
120 THREAD_LIST_UNLOCK(curthread);
125 curthread->state = PS_DEAD;
126 THR_UNLOCK(curthread);
127 curthread->refcount--;
128 if (curthread->tlflags & TLFLAGS_DETACHED)
129 THR_GCLIST_ADD(curthread);
130 THREAD_LIST_UNLOCK(curthread);
131 if (curthread->joiner)
132 _thr_umtx_wake(&curthread->state, INT_MAX);
133 if (SHOULD_REPORT_EVENT(curthread, TD_DEATH))
134 _thr_report_death(curthread);
135 /* Exit and set terminated to once we're really dead. */
136 extexit(EXTEXIT_SETINT|EXTEXIT_LWP, 1, &curthread->terminated);
137 PANIC("thr_exit() returned");
141 __strong_reference(_pthread_exit, pthread_exit);