206 lines
6.1 KiB
C
206 lines
6.1 KiB
C
/*
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* Copyright (c) 1995 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 REGENTS 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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*/
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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 <string.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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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_VIRTUAL, &itimer, NULL);
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/* Close the pthread kernel pipe: */
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_thread_sys_close(_thread_kern_pipe[0]);
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_thread_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 = _thread_sys_fcntl(i, F_GETFL, NULL);
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/* Clear the nonblocking file descriptor flag: */
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_thread_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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_thread_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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strcpy(s, "Fatal error '");
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strcat(s, string);
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strcat(s, "' at line ? ");
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strcat(s, "in file ");
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strcat(s, fname);
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strcat(s, " (errno = ?");
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strcat(s, ")\n");
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/* Write the string to the standard error file descriptor: */
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_thread_sys_write(2, s, strlen(s));
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/* Force this process to exit: */
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_exit(1);
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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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int sig;
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long l;
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pthread_t pthread;
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/* Block signals: */
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_thread_kern_sig_block(NULL);
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/* Save the return value: */
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_thread_run->ret = status;
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while (_thread_run->cleanup != NULL) {
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pthread_cleanup_pop(1);
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}
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if (_thread_run->attr.cleanup_attr != NULL) {
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_thread_run->attr.cleanup_attr(_thread_run->attr.arg_attr);
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}
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/* Check if there is thread specific data: */
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if (_thread_run->specific_data != 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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/* Check if there are any threads joined to this one: */
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while ((pthread = _thread_queue_deq(&(_thread_run->join_queue))) != NULL) {
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/* Wake the joined thread and let it detach this thread: */
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PTHREAD_NEW_STATE(pthread,PS_RUNNING);
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}
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/* Check if the running thread is at the head of the linked list: */
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if (_thread_link_list == _thread_run) {
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/* There is no previous thread: */
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_thread_link_list = _thread_run->nxt;
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} else {
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/* Point to the first thread in the list: */
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pthread = _thread_link_list;
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/*
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* Enter a loop to find the thread in the linked list before
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* the running thread:
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*/
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while (pthread != NULL && pthread->nxt != _thread_run) {
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/* Point to the next thread: */
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pthread = pthread->nxt;
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}
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/* Check that a previous thread was found: */
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if (pthread != NULL) {
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/*
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* Point the previous thread to the one after the
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* running thread:
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*/
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pthread->nxt = _thread_run->nxt;
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}
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}
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/* Check if this is a signal handler thread: */
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if (_thread_run->parent_thread != NULL) {
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/*
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* Enter a loop to search for other threads with the same
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* parent:
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*/
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for (pthread = _thread_link_list; pthread != NULL; pthread = pthread->nxt) {
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/* Compare the parent thread pointers: */
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if (pthread->parent_thread == _thread_run->parent_thread) {
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/*
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* The parent thread is waiting on at least
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* one other signal handler. Exit the loop
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* now that this is known.
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*/
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break;
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}
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}
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/*
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* Check if the parent is not waiting on any other signal
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* handler threads and if it hasn't died in the meantime:
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*/
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if (pthread == NULL && _thread_run->parent_thread->state != PS_DEAD) {
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/* Allow the parent thread to run again: */
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PTHREAD_NEW_STATE(_thread_run->parent_thread,PS_RUNNING);
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}
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/* Get the signal number: */
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l = (long) _thread_run->arg;
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sig = (int) l;
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/* Unblock the signal from the parent thread: */
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sigdelset(&_thread_run->parent_thread->sigmask, sig);
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}
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/*
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* This thread will never run again. Add it to the list of dead
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* threads:
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*/
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_thread_run->nxt = _thread_dead;
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_thread_dead = _thread_run;
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/*
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* The running thread is no longer in the thread link list so it will
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* now die:
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*/
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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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#endif
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