242 lines
7.3 KiB
C
242 lines
7.3 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "pthread_private.h"
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#define FLAGS_IN_SCHEDQ \
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(PTHREAD_FLAGS_IN_PRIOQ|PTHREAD_FLAGS_IN_WAITQ|PTHREAD_FLAGS_IN_WORKQ)
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__weak_reference(_pthread_exit, pthread_exit);
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void _exit(int status)
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{
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int flags;
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int i;
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struct itimerval itimer;
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/* Disable the interval timer: */
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itimer.it_interval.tv_sec = 0;
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itimer.it_interval.tv_usec = 0;
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itimer.it_value.tv_sec = 0;
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itimer.it_value.tv_usec = 0;
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setitimer(_ITIMER_SCHED_TIMER, &itimer, NULL);
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/* Close the pthread kernel pipe: */
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__sys_close(_thread_kern_pipe[0]);
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__sys_close(_thread_kern_pipe[1]);
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/*
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* Enter a loop to set all file descriptors to blocking
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* if they were not created as non-blocking:
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*/
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for (i = 0; i < _thread_dtablesize; i++) {
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/* Check if this file descriptor is in use: */
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if (_thread_fd_table[i] != NULL &&
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!(_thread_fd_table[i]->flags & O_NONBLOCK)) {
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/* Get the current flags: */
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flags = __sys_fcntl(i, F_GETFL, NULL);
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/* Clear the nonblocking file descriptor flag: */
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__sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
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}
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}
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/* Call the _exit syscall: */
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__sys_exit(status);
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}
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void
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_thread_exit(char *fname, int lineno, char *string)
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{
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char s[256];
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/* Prepare an error message string: */
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snprintf(s, sizeof(s),
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"Fatal error '%s' at line %d in file %s (errno = %d)\n",
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string, lineno, fname, errno);
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/* Write the string to the standard error file descriptor: */
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__sys_write(2, s, strlen(s));
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/* Force this process to exit: */
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/* XXX - Do we want abort to be conditional on _PTHREADS_INVARIANTS? */
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#if defined(_PTHREADS_INVARIANTS)
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abort();
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#else
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__sys_exit(1);
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#endif
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}
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/*
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* Only called when a thread is cancelled. It may be more useful
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* to call it from pthread_exit() if other ways of asynchronous or
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* abnormal thread termination can be found.
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*/
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void
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_thread_exit_cleanup(void)
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{
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struct pthread *curthread = _get_curthread();
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/*
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* POSIX states that cancellation/termination of a thread should
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* not release any visible resources (such as mutexes) and that
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* it is the applications responsibility. Resources that are
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* internal to the threads library, including file and fd locks,
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* are not visible to the application and need to be released.
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*/
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/* Unlock all owned fd locks: */
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_thread_fd_unlock_owned(curthread);
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/* Unlock all private mutexes: */
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_mutex_unlock_private(curthread);
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/*
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* This still isn't quite correct because we don't account
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* for held spinlocks (see libc/stdlib/malloc.c).
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*/
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}
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void
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_pthread_exit(void *status)
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{
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struct pthread *curthread = _get_curthread();
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pthread_t pthread;
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/* Check if this thread is already in the process of exiting: */
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if ((curthread->flags & PTHREAD_EXITING) != 0) {
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char msg[128];
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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);
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PANIC(msg);
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}
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/* Flag this thread as exiting: */
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curthread->flags |= PTHREAD_EXITING;
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/* Save the return value: */
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curthread->ret = status;
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while (curthread->cleanup != NULL) {
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pthread_cleanup_pop(1);
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}
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if (curthread->attr.cleanup_attr != NULL) {
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curthread->attr.cleanup_attr(curthread->attr.arg_attr);
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}
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/* Check if there is thread specific data: */
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if (curthread->specific != NULL) {
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/* Run the thread-specific data destructors: */
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_thread_cleanupspecific();
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}
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/* Free thread-specific poll_data structure, if allocated: */
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if (curthread->poll_data.fds != NULL) {
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free(curthread->poll_data.fds);
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curthread->poll_data.fds = NULL;
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}
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/*
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* Lock the garbage collector mutex to ensure that the garbage
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* collector is not using the dead thread list.
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*/
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if (pthread_mutex_lock(&_gc_mutex) != 0)
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PANIC("Cannot lock gc mutex");
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/* Add this thread to the list of dead threads. */
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TAILQ_INSERT_HEAD(&_dead_list, curthread, dle);
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/*
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* Signal the garbage collector thread that there is something
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* to clean up.
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*/
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if (pthread_cond_signal(&_gc_cond) != 0)
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PANIC("Cannot signal gc cond");
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/*
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* Avoid a race condition where a scheduling signal can occur
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* causing the garbage collector thread to run. If this happens,
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* the current thread can be cleaned out from under us.
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*/
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_thread_kern_sig_defer();
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/* Unlock the garbage collector mutex: */
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if (pthread_mutex_unlock(&_gc_mutex) != 0)
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PANIC("Cannot unlock gc mutex");
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/* Check if there is a thread joining this one: */
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if (curthread->joiner != NULL) {
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pthread = curthread->joiner;
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curthread->joiner = NULL;
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switch (pthread->suspended) {
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case SUSP_JOIN:
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/*
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* The joining thread is suspended. Change the
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* suspension state to make the thread runnable when it
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* is resumed:
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*/
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pthread->suspended = SUSP_NO;
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break;
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case SUSP_NO:
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/* Make the joining thread runnable: */
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PTHREAD_NEW_STATE(pthread, PS_RUNNING);
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break;
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default:
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PANIC("Unreachable code reached");
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}
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/* Set the return value for the joining thread: */
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pthread->join_status.ret = curthread->ret;
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pthread->join_status.error = 0;
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pthread->join_status.thread = NULL;
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/* Make this thread collectable by the garbage collector. */
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PTHREAD_ASSERT(((curthread->attr.flags & PTHREAD_DETACHED) ==
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0), "Cannot join a detached thread");
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curthread->attr.flags |= PTHREAD_DETACHED;
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}
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/* Remove this thread from the thread list: */
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TAILQ_REMOVE(&_thread_list, curthread, tle);
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/* This thread will never be re-scheduled. */
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_thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
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/* This point should not be reached. */
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PANIC("Dead thread has resumed");
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}
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