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1/* $OpenBSD: rthread_once.c,v 1.3 2017/11/04 22:53:57 jca Exp $ */
2/*
3 * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <pthread.h>
20
21int
22pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
23{
24 pthread_mutex_lock(&once_control->mutex);
25 if (once_control->state == PTHREAD_NEEDS_INIT) {
26 init_routine();
27 once_control->state = PTHREAD_DONE_INIT;
28 }
29 pthread_mutex_unlock(&once_control->mutex);
30
31 return (0);
32}