pthread_once.c revision 1.2.2.3
1 1.2.2.3 yamt /* $NetBSD: pthread_once.c,v 1.2.2.3 2014/05/22 11:36:59 yamt Exp $ */ 2 1.2.2.2 yamt 3 1.2.2.2 yamt /*- 4 1.2.2.2 yamt * Copyright (c) 2001, 2003 The NetBSD Foundation, Inc. 5 1.2.2.2 yamt * All rights reserved. 6 1.2.2.2 yamt * 7 1.2.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 yamt * by Nathan J. Williams, and by Jason R. Thorpe. 9 1.2.2.2 yamt * 10 1.2.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 yamt * modification, are permitted provided that the following conditions 12 1.2.2.2 yamt * are met: 13 1.2.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.2.2 yamt * 3. All advertising materials mentioning features or use of this software 19 1.2.2.2 yamt * must display the following acknowledgement: 20 1.2.2.2 yamt * This product includes software developed by the NetBSD 21 1.2.2.2 yamt * Foundation, Inc. and its contributors. 22 1.2.2.2 yamt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.2.2 yamt * contributors may be used to endorse or promote products derived 24 1.2.2.2 yamt * from this software without specific prior written permission. 25 1.2.2.2 yamt * 26 1.2.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 37 1.2.2.2 yamt */ 38 1.2.2.2 yamt 39 1.2.2.2 yamt #include <sys/cdefs.h> 40 1.2.2.3 yamt __RCSID("$NetBSD: pthread_once.c,v 1.2.2.3 2014/05/22 11:36:59 yamt Exp $"); 41 1.2.2.2 yamt 42 1.2.2.2 yamt #include "pthread.h" 43 1.2.2.3 yamt #include "pthread_int.h" 44 1.2.2.3 yamt #include "reentrant.h" 45 1.2.2.2 yamt 46 1.2.2.2 yamt static void 47 1.2.2.2 yamt once_cleanup(void *closure) 48 1.2.2.2 yamt { 49 1.2.2.2 yamt 50 1.2.2.2 yamt pthread_mutex_unlock((pthread_mutex_t *)closure); 51 1.2.2.2 yamt } 52 1.2.2.2 yamt 53 1.2.2.2 yamt int 54 1.2.2.2 yamt pthread_once(pthread_once_t *once_control, void (*routine)(void)) 55 1.2.2.2 yamt { 56 1.2.2.3 yamt if (__predict_false(__uselibcstub)) 57 1.2.2.3 yamt return __libc_thr_once_stub(once_control, routine); 58 1.2.2.2 yamt 59 1.2.2.2 yamt if (once_control->pto_done == 0) { 60 1.2.2.2 yamt pthread_mutex_lock(&once_control->pto_mutex); 61 1.2.2.2 yamt pthread_cleanup_push(&once_cleanup, &once_control->pto_mutex); 62 1.2.2.2 yamt if (once_control->pto_done == 0) { 63 1.2.2.2 yamt routine(); 64 1.2.2.2 yamt once_control->pto_done = 1; 65 1.2.2.2 yamt } 66 1.2.2.2 yamt pthread_cleanup_pop(1); 67 1.2.2.2 yamt } 68 1.2.2.2 yamt 69 1.2.2.2 yamt return 0; 70 1.2.2.2 yamt } 71 1.2.2.2 yamt 72 1.2.2.2 yamt __strong_alias(__libc_thr_once,pthread_once) 73
Indexes created Tue Sep 30 06:09:59 GMT 2025