diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_exit.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_exit.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_exit.c b/lib/libc_r/uthread/uthread_exit.c new file mode 100644 index 0000000..292fce9 --- /dev/null +++ b/lib/libc_r/uthread/uthread_exit.c @@ -0,0 +1,167 @@ +/* + * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ +#include <errno.h> +#include <string.h> +#ifdef _THREAD_SAFE +#include <pthread.h> +#include "pthread_private.h" + +void +_thread_exit(char *fname, int lineno, char *string) +{ + char s[256]; + + /* Prepare an error message string: */ + strcpy(s, "Fatal error '"); + strcat(s, string); + strcat(s, "' at line ? "); + strcat(s, "in file "); + strcat(s, fname); + strcat(s, " (errno = ?"); + strcat(s, ")\n"); + + /* Write the string to the standard error file descriptor: */ + _thread_sys_write(2, s, strlen(s)); + + /* Force this process to exit: */ + _exit(1); +} + +void +pthread_exit(void *status) +{ + int sig; + long l; + pthread_t pthread; + + /* Block signals: */ + _thread_kern_sig_block(NULL); + + /* Save the return value: */ + _thread_run->ret = status; + + while (_thread_run->cleanup != NULL) { + _thread_cleanup_pop(1); + } + + if (_thread_run->attr.cleanup_attr != NULL) { + _thread_run->attr.cleanup_attr(_thread_run->attr.arg_attr); + } + /* Check if there is thread specific data: */ + if (_thread_run->specific_data != NULL) { + /* Run the thread-specific data destructors: */ + _thread_cleanupspecific(); + } + /* Check if there are any threads joined to this one: */ + while ((pthread = _thread_queue_deq(&(_thread_run->join_queue))) != NULL) { + /* Wake the joined thread and let it detach this thread: */ + pthread->state = PS_RUNNING; + } + + /* Check if the running thread is at the head of the linked list: */ + if (_thread_link_list == _thread_run) { + /* There is no previous thread: */ + _thread_link_list = _thread_run->nxt; + } else { + /* Point to the first thread in the list: */ + pthread = _thread_link_list; + + /* + * Enter a loop to find the thread in the linked list before + * the running thread: + */ + while (pthread != NULL && pthread->nxt != _thread_run) { + /* Point to the next thread: */ + pthread = pthread->nxt; + } + + /* Check that a previous thread was found: */ + if (pthread != NULL) { + /* + * Point the previous thread to the one after the + * running thread: + */ + pthread->nxt = _thread_run->nxt; + } + } + + /* Check if this is a signal handler thread: */ + if (_thread_run->parent_thread != NULL) { + /* + * Enter a loop to search for other threads with the same + * parent: + */ + for (pthread = _thread_link_list; pthread != NULL; pthread = pthread->nxt) { + /* Compare the parent thread pointers: */ + if (pthread->parent_thread == _thread_run->parent_thread) { + /* + * The parent thread is waiting on at least + * one other signal handler. Exit the loop + * now that this is known. + */ + break; + } + } + + /* + * Check if the parent is not waiting on any other signal + * handler threads: + */ + if (pthread == NULL) { + /* Allow the parent thread to run again: */ + _thread_run->parent_thread->state = PS_RUNNING; + } + /* Get the signal number: */ + l = (long) _thread_run->arg; + sig = (int) l; + + /* Unblock the signal from the parent thread: */ + sigdelset(&_thread_run->parent_thread->sigmask, sig); + } + /* + * This thread will never run again. Add it to the list of dead + * threads: + */ + _thread_run->nxt = _thread_dead; + _thread_dead = _thread_run; + + /* + * The running thread is no longer in the thread link list so it will + * now die: + */ + _thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__); + + /* This point should not be reached. */ + PANIC("Dead thread has resumed"); +} +#endif |
