1/*	$NetBSD: once.h,v 1.6 2020/05/25 20:47:23 christos Exp $	*/
2
3/*
4 * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1999-2001  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/* Id: once.h,v 1.9 2007/06/19 23:47:20 tbox Exp  */
21
22#ifndef ISC_ONCE_H
23#define ISC_ONCE_H 1
24
25#include <isc/lang.h>
26#include <isc/result.h>
27
28ISC_LANG_BEGINDECLS
29
30typedef struct {
31	int status;
32	LONG counter;
33} isc_once_t;
34
35#define ISC_ONCE_INIT_NEEDED 0
36#define ISC_ONCE_INIT_DONE 1
37
38#define ISC_ONCE_INIT { ISC_ONCE_INIT_NEEDED, 1 }
39
40isc_result_t
41isc_once_do(isc_once_t *controller, void(*function)(void));
42
43ISC_LANG_ENDDECLS
44
45#endif /* ISC_ONCE_H */
46