0340faafa1
a knob to force process scope threads. If the environment variable
LIBPTHREAD_PROCESS_SCOPE is set, force all threads to be process
scope threads regardless of how the application creates them. If
LIBPTHREAD_SYSTEM_SCOPE is set (forcing system scope threads), it
overrides LIBPTHREAD_PROCESS_SCOPE.
$ # To force system scope threads
$ LIBPTHREAD_SYSTEM_SCOPE=anything threaded_app
$ # To force process scope threads
$ LIBPTHREAD_PROCESS_SCOPE=anything threaded_app
147 lines
4.8 KiB
C
147 lines
4.8 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 "thr_private.h"
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void _pthread_exit(void *status);
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__weak_reference(_pthread_exit, pthread_exit);
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void
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_thr_exit(char *fname, int lineno, char *msg)
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{
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/* Write an error message to the standard error file descriptor: */
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_thread_printf(2,
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"Fatal error '%s' at line %d in file %s (errno = %d)\n",
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msg, lineno, fname, errno);
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abort();
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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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_thr_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 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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kse_critical_t crit;
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struct kse *curkse;
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/* Check if this thread is already in the process of exiting: */
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if ((curthread->flags & THR_FLAGS_EXITING) != 0) {
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char msg[128];
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snprintf(msg, sizeof(msg), "Thread %p has called "
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"pthread_exit() from a destructor. POSIX 1003.1 "
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"1996 s16.2.5.2 does not allow this!", curthread);
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PANIC(msg);
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}
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/*
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* Flag this thread as exiting. Threads should now be prevented
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* from joining to this thread.
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*/
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THR_SCHED_LOCK(curthread, curthread);
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curthread->flags |= THR_FLAGS_EXITING;
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THR_SCHED_UNLOCK(curthread, curthread);
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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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if (!_kse_isthreaded())
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exit(0);
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crit = _kse_critical_enter();
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curkse = _get_curkse();
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KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
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/* Use thread_list_lock */
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_thread_active_threads--;
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if ((_thread_scope_system <= 0 && _thread_active_threads == 1) ||
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(_thread_scope_system > 0 && _thread_active_threads == 0)) {
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KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
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_kse_critical_leave(crit);
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exit(0);
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/* Never reach! */
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}
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KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
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/* This thread will never be re-scheduled. */
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KSE_LOCK(curkse);
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THR_SET_STATE(curthread, PS_DEAD);
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_thr_sched_switch_unlocked(curthread);
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/* Never reach! */
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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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