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Diffstat (limited to 'lib/libkse/thread/thr_once.c')
| -rw-r--r-- | lib/libkse/thread/thr_once.c | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/lib/libkse/thread/thr_once.c b/lib/libkse/thread/thr_once.c deleted file mode 100644 index eae29ac..0000000 --- a/lib/libkse/thread/thr_once.c +++ /dev/null @@ -1,96 +0,0 @@ -/* - * 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. 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 "namespace.h" -#include <pthread.h> -#include "un-namespace.h" -#include "thr_private.h" - -__weak_reference(_pthread_once, pthread_once); - -#define ONCE_NEVER_DONE PTHREAD_NEEDS_INIT -#define ONCE_DONE PTHREAD_DONE_INIT -#define ONCE_IN_PROGRESS 0x02 -#define ONCE_MASK 0x03 - -static pthread_mutex_t once_lock = PTHREAD_MUTEX_INITIALIZER; -static pthread_cond_t once_cv = PTHREAD_COND_INITIALIZER; - -/* - * POSIX: - * The pthread_once() function is not a cancellation point. However, - * if init_routine is a cancellation point and is canceled, the effect - * on once_control shall be as if pthread_once() was never called. - */ - -static void -once_cancel_handler(void *arg) -{ - pthread_once_t *once_control = arg; - - _pthread_mutex_lock(&once_lock); - once_control->state = ONCE_NEVER_DONE; - _pthread_mutex_unlock(&once_lock); - _pthread_cond_broadcast(&once_cv); -} - -int -_pthread_once(pthread_once_t *once_control, void (*init_routine) (void)) -{ - struct pthread *curthread; - int wakeup = 0; - - if (once_control->state == ONCE_DONE) - return (0); - _pthread_mutex_lock(&once_lock); - while (*(volatile int *)&(once_control->state) == ONCE_IN_PROGRESS) - _pthread_cond_wait(&once_cv, &once_lock); - /* - * If previous thread was canceled, then the state still - * could be ONCE_NEVER_DONE, we need to check it again. - */ - if (*(volatile int *)&(once_control->state) == ONCE_NEVER_DONE) { - once_control->state = ONCE_IN_PROGRESS; - _pthread_mutex_unlock(&once_lock); - curthread = _get_curthread(); - THR_CLEANUP_PUSH(curthread, once_cancel_handler, once_control); - init_routine(); - THR_CLEANUP_POP(curthread, 0); - _pthread_mutex_lock(&once_lock); - once_control->state = ONCE_DONE; - wakeup = 1; - } - _pthread_mutex_unlock(&once_lock); - if (wakeup) - _pthread_cond_broadcast(&once_cv); - return (0); -} - |
