From 08f648d4cdd32dc685715d9d1bb328fcc2ccd6c8 Mon Sep 17 00:00:00 2001 From: jeff Date: Tue, 1 Apr 2003 03:46:29 +0000 Subject: - Add libthr but don't hook it up to the regular build yet. This is an adaptation of libc_r for the thr system call interface. This is beta quality code. --- lib/libthr/thread/thr_once.c | 53 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 lib/libthr/thread/thr_once.c (limited to 'lib/libthr/thread/thr_once.c') diff --git a/lib/libthr/thread/thr_once.c b/lib/libthr/thread/thr_once.c new file mode 100644 index 0000000..cef478d --- /dev/null +++ b/lib/libthr/thread/thr_once.c @@ -0,0 +1,53 @@ +/* + * Copyright (c) 1995 John Birrell . + * 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 +#include "thr_private.h" + +__weak_reference(_pthread_once, pthread_once); + +int +_pthread_once(pthread_once_t * once_control, void (*init_routine) (void)) +{ + if (once_control->state == PTHREAD_NEEDS_INIT) { + if (_thread_initial == NULL) + _thread_init(); + pthread_mutex_lock(&(once_control->mutex)); + if (once_control->state == PTHREAD_NEEDS_INIT) { + init_routine(); + once_control->state = PTHREAD_DONE_INIT; + } + pthread_mutex_unlock(&(once_control->mutex)); + } + return (0); +} -- cgit v1.1