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 21 int 22 pthread_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 } 33