diff options
Diffstat (limited to 'lib/libpthread/thread/thr_exit.c')
| -rw-r--r-- | lib/libpthread/thread/thr_exit.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_exit.c b/lib/libpthread/thread/thr_exit.c new file mode 100644 index 0000000..ec8e9ec --- /dev/null +++ b/lib/libpthread/thread/thr_exit.c @@ -0,0 +1,146 @@ +/* + * Copyright (c) 1995-1998 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 AUTHOR 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. + * + * $FreeBSD$ + */ +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <pthread.h> +#include "thr_private.h" + +void _pthread_exit(void *status); + +__weak_reference(_pthread_exit, pthread_exit); + +void +_thr_exit(char *fname, int lineno, char *msg) +{ + + /* Write an error message to the standard error file descriptor: */ + _thread_printf(2, + "Fatal error '%s' at line %d in file %s (errno = %d)\n", + msg, lineno, fname, errno); + + abort(); +} + +/* + * Only called when a thread is cancelled. It may be more useful + * to call it from pthread_exit() if other ways of asynchronous or + * abnormal thread termination can be found. + */ +void +_thr_exit_cleanup(void) +{ + struct pthread *curthread = _get_curthread(); + + /* + * POSIX states that cancellation/termination of a thread should + * not release any visible resources (such as mutexes) and that + * it is the applications responsibility. Resources that are + * internal to the threads library, including file and fd locks, + * are not visible to the application and need to be released. + */ + /* Unlock all private mutexes: */ + _mutex_unlock_private(curthread); + + /* + * This still isn't quite correct because we don't account + * for held spinlocks (see libc/stdlib/malloc.c). + */ +} + +void +_pthread_exit(void *status) +{ + struct pthread *curthread = _get_curthread(); + kse_critical_t crit; + struct kse *curkse; + + /* Check if this thread is already in the process of exiting: */ + if ((curthread->flags & THR_FLAGS_EXITING) != 0) { + char msg[128]; + 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); + PANIC(msg); + } + + /* + * Flag this thread as exiting. Threads should now be prevented + * from joining to this thread. + */ + THR_SCHED_LOCK(curthread, curthread); + curthread->flags |= THR_FLAGS_EXITING; + THR_SCHED_UNLOCK(curthread, curthread); + + /* Save the return value: */ + curthread->ret = status; + while (curthread->cleanup != NULL) { + pthread_cleanup_pop(1); + } + if (curthread->attr.cleanup_attr != NULL) { + curthread->attr.cleanup_attr(curthread->attr.arg_attr); + } + /* Check if there is thread specific data: */ + if (curthread->specific != NULL) { + /* Run the thread-specific data destructors: */ + _thread_cleanupspecific(); + } + if (!_kse_isthreaded()) + exit(0); + crit = _kse_critical_enter(); + curkse = _get_curkse(); + KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock); + /* Use thread_list_lock */ + _thread_active_threads--; + if ((_thread_scope_system == 0 && _thread_active_threads == 1) || + (_thread_scope_system != 0 && _thread_active_threads == 0)) { + KSE_LOCK_RELEASE(curkse, &_thread_list_lock); + _kse_critical_leave(crit); + exit(0); + /* Never reach! */ + } + KSE_LOCK_RELEASE(curkse, &_thread_list_lock); + + /* This thread will never be re-scheduled. */ + KSE_LOCK(curkse); + THR_SET_STATE(curthread, PS_DEAD); + _thr_sched_switch_unlocked(curthread); + /* Never reach! */ + + /* This point should not be reached. */ + PANIC("Dead thread has resumed"); +} |
