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