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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_exit.c,v 1.16.2.8 2002/10/22 14:44:03 fjoe Exp $
33 * $DragonFly: src/lib/libc_r/uthread/uthread_exit.c,v 1.2 2003/06/17 04:26:48 dillon Exp $
42 #include "pthread_private.h"
44 #define FLAGS_IN_SCHEDQ \
45 (PTHREAD_FLAGS_IN_PRIOQ|PTHREAD_FLAGS_IN_WAITQ|PTHREAD_FLAGS_IN_WORKQ)
47 __weak_reference(_pthread_exit, pthread_exit);
49 void __exit(int status)
53 struct itimerval itimer;
55 /* Disable the interval timer: */
56 itimer.it_interval.tv_sec = 0;
57 itimer.it_interval.tv_usec = 0;
58 itimer.it_value.tv_sec = 0;
59 itimer.it_value.tv_usec = 0;
60 setitimer(_ITIMER_SCHED_TIMER, &itimer, NULL);
62 /* Close the pthread kernel pipe: */
63 __sys_close(_thread_kern_pipe[0]);
64 __sys_close(_thread_kern_pipe[1]);
67 * Enter a loop to set all file descriptors to blocking
68 * if they were not created as non-blocking:
70 for (i = 0; i < _thread_dtablesize; i++) {
71 /* Check if this file descriptor is in use: */
72 if (_thread_fd_table[i] != NULL &&
73 (_thread_fd_getflags(i) & O_NONBLOCK) == 0) {
74 /* Get the current flags: */
75 flags = __sys_fcntl(i, F_GETFL, NULL);
76 /* Clear the nonblocking file descriptor flag: */
77 __sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
81 /* Call the _exit syscall: */
85 __strong_reference(__exit, _exit);
88 _thread_exit(char *fname, int lineno, char *string)
92 /* Prepare an error message string: */
93 strcpy(s, "Fatal error '");
95 strcat(s, "' at line ? ");
96 strcat(s, "in file ");
98 strcat(s, " (errno = ?");
101 /* Write the string to the standard error file descriptor: */
102 __sys_write(2, s, strlen(s));
104 /* Force this process to exit: */
105 /* XXX - Do we want abort to be conditional on _PTHREADS_INVARIANTS? */
106 #if defined(_PTHREADS_INVARIANTS)
114 * Only called when a thread is cancelled. It may be more useful
115 * to call it from pthread_exit() if other ways of asynchronous or
116 * abnormal thread termination can be found.
119 _thread_exit_cleanup(void)
121 struct pthread *curthread = _get_curthread();
124 * POSIX states that cancellation/termination of a thread should
125 * not release any visible resources (such as mutexes) and that
126 * it is the applications responsibility. Resources that are
127 * internal to the threads library, including file and fd locks,
128 * are not visible to the application and need to be released.
130 /* Unlock all owned fd locks: */
131 _thread_fd_unlock_owned(curthread);
133 /* Unlock all owned file locks: */
134 _funlock_owned(curthread);
136 /* Unlock all private mutexes: */
137 _mutex_unlock_private(curthread);
140 * This still isn't quite correct because we don't account
141 * for held spinlocks (see libc/stdlib/malloc.c).
146 _pthread_exit(void *status)
148 struct pthread *curthread = _get_curthread();
151 /* Check if this thread is already in the process of exiting: */
152 if ((curthread->flags & PTHREAD_EXITING) != 0) {
154 snprintf(msg, sizeof(msg), "Thread %p has called pthread_exit() from a destructor. POSIX 1003.1 1996 s16.2.5.2 does not allow this!",curthread);
158 /* Flag this thread as exiting: */
159 curthread->flags |= PTHREAD_EXITING;
161 /* Save the return value: */
162 curthread->ret = status;
164 while (curthread->cleanup != NULL) {
165 pthread_cleanup_pop(1);
167 if (curthread->attr.cleanup_attr != NULL) {
168 curthread->attr.cleanup_attr(curthread->attr.arg_attr);
170 /* Check if there is thread specific data: */
171 if (curthread->specific_data != NULL) {
172 /* Run the thread-specific data destructors: */
173 _thread_cleanupspecific();
176 /* Free thread-specific poll_data structure, if allocated: */
177 if (curthread->poll_data.fds != NULL) {
178 free(curthread->poll_data.fds);
179 curthread->poll_data.fds = NULL;
183 * Lock the garbage collector mutex to ensure that the garbage
184 * collector is not using the dead thread list.
186 if (pthread_mutex_lock(&_gc_mutex) != 0)
187 PANIC("Cannot lock gc mutex");
189 /* Add this thread to the list of dead threads. */
190 TAILQ_INSERT_HEAD(&_dead_list, curthread, dle);
193 * Signal the garbage collector thread that there is something
196 if (pthread_cond_signal(&_gc_cond) != 0)
197 PANIC("Cannot signal gc cond");
200 * Avoid a race condition where a scheduling signal can occur
201 * causing the garbage collector thread to run. If this happens,
202 * the current thread can be cleaned out from under us.
204 _thread_kern_sig_defer();
206 /* Unlock the garbage collector mutex: */
207 if (pthread_mutex_unlock(&_gc_mutex) != 0)
208 PANIC("Cannot unlock gc mutex");
210 /* Check if there is a thread joining this one: */
211 if (curthread->joiner != NULL) {
212 pthread = curthread->joiner;
213 curthread->joiner = NULL;
215 /* Make the joining thread runnable: */
216 PTHREAD_NEW_STATE(pthread, PS_RUNNING);
218 /* Set the return value for the joining thread: */
219 pthread->join_status.ret = curthread->ret;
220 pthread->join_status.error = 0;
221 pthread->join_status.thread = NULL;
223 /* Make this thread collectable by the garbage collector. */
224 PTHREAD_ASSERT(((curthread->attr.flags & PTHREAD_DETACHED) ==
225 0), "Cannot join a detached thread");
226 curthread->attr.flags |= PTHREAD_DETACHED;
229 /* Remove this thread from the thread list: */
230 TAILQ_REMOVE(&_thread_list, curthread, tle);
232 /* This thread will never be re-scheduled. */
233 _thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
235 /* This point should not be reached. */
236 PANIC("Dead thread has resumed");