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
40 #include "namespace.h"
42 #include "un-namespace.h"
43 #include "pthread_private.h"
45 __weak_reference(_pthread_exit, pthread_exit);
47 void _exit(int status)
51 struct itimerval itimer;
53 /* Disable the interval timer: */
54 itimer.it_interval.tv_sec = 0;
55 itimer.it_interval.tv_usec = 0;
56 itimer.it_value.tv_sec = 0;
57 itimer.it_value.tv_usec = 0;
58 setitimer(_ITIMER_SCHED_TIMER, &itimer, NULL);
60 /* Close the pthread kernel pipe: */
61 __sys_close(_thread_kern_pipe[0]);
62 __sys_close(_thread_kern_pipe[1]);
65 * Enter a loop to set all file descriptors to blocking
66 * if they were not created as non-blocking:
68 for (i = 0; i < _thread_dtablesize; i++) {
69 /* Check if this file descriptor is in use: */
70 if (_thread_fd_table[i] != NULL &&
71 (_thread_fd_getflags(i) & O_NONBLOCK) == 0) {
72 /* Get the current flags: */
73 flags = __sys_fcntl(i, F_GETFL, NULL);
74 /* Clear the nonblocking file descriptor flag: */
75 __sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
79 /* Call the _exit syscall: */
84 _thread_exit(char *fname, int lineno, char *string)
88 /* Prepare an error message string: */
89 snprintf(s, sizeof(s),
90 "Fatal error '%s' at line %d in file %s (errno = %d)\n",
91 string, lineno, fname, errno);
93 /* Write the string to the standard error file descriptor: */
94 __sys_write(2, s, strlen(s));
96 /* Force this process to exit: */
97 /* XXX - Do we want abort to be conditional on _PTHREADS_INVARIANTS? */
98 #if defined(_PTHREADS_INVARIANTS)
106 * Only called when a thread is cancelled. It may be more useful
107 * to call it from pthread_exit() if other ways of asynchronous or
108 * abnormal thread termination can be found.
111 _thread_exit_cleanup(void)
113 struct pthread *curthread = _get_curthread();
116 * POSIX states that cancellation/termination of a thread should
117 * not release any visible resources (such as mutexes) and that
118 * it is the applications responsibility. Resources that are
119 * internal to the threads library, including file and fd locks,
120 * are not visible to the application and need to be released.
122 /* Unlock all owned fd locks: */
123 _thread_fd_unlock_owned(curthread);
125 /* Unlock all private mutexes: */
126 _mutex_unlock_private(curthread);
129 * This still isn't quite correct because we don't account
130 * for held spinlocks (see libc/stdlib/malloc.c).
135 _pthread_exit(void *status)
137 struct pthread *curthread = _get_curthread();
140 /* Check if this thread is already in the process of exiting: */
141 if ((curthread->flags & PTHREAD_EXITING) != 0) {
143 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);
147 /* Flag this thread as exiting: */
148 curthread->flags |= PTHREAD_EXITING;
150 /* Save the return value: */
151 curthread->ret = status;
153 while (curthread->cleanup != NULL) {
154 pthread_cleanup_pop(1);
156 if (curthread->attr.cleanup_attr != NULL) {
157 curthread->attr.cleanup_attr(curthread->attr.arg_attr);
159 /* Check if there is thread specific data: */
160 if (curthread->specific != NULL) {
161 /* Run the thread-specific data destructors: */
162 _thread_cleanupspecific();
165 /* Free thread-specific poll_data structure, if allocated: */
166 if (curthread->poll_data.fds != NULL) {
167 free(curthread->poll_data.fds);
168 curthread->poll_data.fds = NULL;
172 * Lock the garbage collector mutex to ensure that the garbage
173 * collector is not using the dead thread list.
175 if (_pthread_mutex_lock(&_gc_mutex) != 0)
176 PANIC("Cannot lock gc mutex");
178 /* Add this thread to the list of dead threads. */
179 TAILQ_INSERT_HEAD(&_dead_list, curthread, dle);
182 * Signal the garbage collector thread that there is something
185 if (_pthread_cond_signal(&_gc_cond) != 0)
186 PANIC("Cannot signal gc cond");
189 * Avoid a race condition where a scheduling signal can occur
190 * causing the garbage collector thread to run. If this happens,
191 * the current thread can be cleaned out from under us.
193 _thread_kern_sig_defer();
195 /* Unlock the garbage collector mutex: */
196 if (_pthread_mutex_unlock(&_gc_mutex) != 0)
197 PANIC("Cannot unlock gc mutex");
199 /* Check if there is a thread joining this one: */
200 if (curthread->joiner != NULL) {
201 pthread = curthread->joiner;
202 curthread->joiner = NULL;
204 /* Make the joining thread runnable: */
205 PTHREAD_NEW_STATE(pthread, PS_RUNNING);
207 /* Set the return value for the joining thread: */
208 pthread->join_status.ret = curthread->ret;
209 pthread->join_status.error = 0;
210 pthread->join_status.thread = NULL;
212 /* Make this thread collectable by the garbage collector. */
213 PTHREAD_ASSERT(((curthread->attr.flags & PTHREAD_DETACHED) ==
214 0), "Cannot join a detached thread");
215 curthread->attr.flags |= PTHREAD_DETACHED;
218 /* Remove this thread from the thread list: */
219 TAILQ_REMOVE(&_thread_list, curthread, tle);
221 /* This thread will never be re-scheduled. */
222 _thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
224 /* This point should not be reached. */
225 PANIC("Dead thread has resumed");