76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
/* $NetBSD: pthread_once.c,v 1.4 2022/02/12 14:59:32 riastradh Exp $ */
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/*-
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* Copyright (c) 2001, 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams, and by Jason R. Thorpe.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_once.c,v 1.4 2022/02/12 14:59:32 riastradh Exp $");
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/* Need to use libc-private names for atomic operations. */
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#include "../../common/lib/libc/atomic/atomic_op_namespace.h"
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#include "pthread.h"
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#include "pthread_int.h"
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#include "reentrant.h"
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static void
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once_cleanup(void *closure)
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{
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pthread_mutex_unlock((pthread_mutex_t *)closure);
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}
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int
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pthread_once(pthread_once_t *once_control, void (*routine)(void))
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{
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if (__predict_false(__uselibcstub))
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return __libc_thr_once_stub(once_control, routine);
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if (once_control->pto_done == 0) {
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pthread_mutex_lock(&once_control->pto_mutex);
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pthread_cleanup_push(&once_cleanup, &once_control->pto_mutex);
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if (once_control->pto_done == 0) {
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routine();
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once_control->pto_done = 1;
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}
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pthread_cleanup_pop(1);
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}
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return 0;
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}
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__strong_alias(__libc_thr_once,pthread_once)
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