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call_once.c revision 1.2.2.2 
      1  1.2.2.2  christos /*	$NetBSD: call_once.c,v 1.2.2.2 2019/06/10 22:05:26 christos Exp $	*/
      2  1.2.2.2  christos 
      3  1.2.2.2  christos /*-
      4  1.2.2.2  christos  * Copyright (c) 2016 The NetBSD Foundation, Inc.
      5  1.2.2.2  christos  * All rights reserved.
      6  1.2.2.2  christos  *
      7  1.2.2.2  christos  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2.2.2  christos  * by Kamil Rytarowski.
      9  1.2.2.2  christos  *
     10  1.2.2.2  christos  * Redistribution and use in source and binary forms, with or without
     11  1.2.2.2  christos  * modification, are permitted provided that the following conditions
     12  1.2.2.2  christos  * are met:
     13  1.2.2.2  christos  * 1. Redistributions of source code must retain the above copyright
     14  1.2.2.2  christos  *    notice, this list of conditions and the following disclaimer.
     15  1.2.2.2  christos  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2.2.2  christos  *    notice, this list of conditions and the following disclaimer in the
     17  1.2.2.2  christos  *    documentation and/or other materials provided with the distribution.
     18  1.2.2.2  christos  *
     19  1.2.2.2  christos  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2.2.2  christos  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2.2.2  christos  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2.2.2  christos  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2.2.2  christos  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2.2.2  christos  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2.2.2  christos  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2.2.2  christos  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2.2.2  christos  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2.2.2  christos  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2.2.2  christos  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2.2.2  christos  */
     31  1.2.2.2  christos 
     32  1.2.2.2  christos #include <sys/cdefs.h>
     33  1.2.2.2  christos __RCSID("$NetBSD: call_once.c,v 1.2.2.2 2019/06/10 22:05:26 christos Exp $");
     34  1.2.2.2  christos 
     35  1.2.2.2  christos #include <assert.h>
     36  1.2.2.2  christos #include <pthread.h>
     37  1.2.2.2  christos #include <threads.h>
     38  1.2.2.2  christos 
     39  1.2.2.2  christos void
     40  1.2.2.2  christos call_once(once_flag *flag, void (*func)(void))
     41  1.2.2.2  christos {
     42  1.2.2.2  christos 
     43  1.2.2.2  christos 	_DIAGASSERT(flag != NULL);
     44  1.2.2.2  christos 	_DIAGASSERT(func != NULL);
     45  1.2.2.2  christos 
     46  1.2.2.2  christos 	/*
     47  1.2.2.2  christos 	 * The call_once(3) function that conforms to C11 returns no value.
     48  1.2.2.2  christos 	 */
     49  1.2.2.2  christos 	(void)pthread_once(flag, func);
     50  1.2.2.2  christos }
     51