1*00b67f09SDavid van Moolenbroek /* $NetBSD: once.c,v 1.4 2014/12/10 04:38:01 christos Exp $ */
2*00b67f09SDavid van Moolenbroek
3*00b67f09SDavid van Moolenbroek /*
4*00b67f09SDavid van Moolenbroek * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
5*00b67f09SDavid van Moolenbroek * Copyright (C) 1999-2001 Internet Software Consortium.
6*00b67f09SDavid van Moolenbroek *
7*00b67f09SDavid van Moolenbroek * Permission to use, copy, modify, and/or distribute this software for any
8*00b67f09SDavid van Moolenbroek * purpose with or without fee is hereby granted, provided that the above
9*00b67f09SDavid van Moolenbroek * copyright notice and this permission notice appear in all copies.
10*00b67f09SDavid van Moolenbroek *
11*00b67f09SDavid van Moolenbroek * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12*00b67f09SDavid van Moolenbroek * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13*00b67f09SDavid van Moolenbroek * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14*00b67f09SDavid van Moolenbroek * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15*00b67f09SDavid van Moolenbroek * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16*00b67f09SDavid van Moolenbroek * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17*00b67f09SDavid van Moolenbroek * PERFORMANCE OF THIS SOFTWARE.
18*00b67f09SDavid van Moolenbroek */
19*00b67f09SDavid van Moolenbroek
20*00b67f09SDavid van Moolenbroek /* Id: once.c,v 1.12 2007/06/18 23:47:49 tbox Exp */
21*00b67f09SDavid van Moolenbroek
22*00b67f09SDavid van Moolenbroek /* Principal Authors: DCL */
23*00b67f09SDavid van Moolenbroek
24*00b67f09SDavid van Moolenbroek #include <config.h>
25*00b67f09SDavid van Moolenbroek
26*00b67f09SDavid van Moolenbroek #include <windows.h>
27*00b67f09SDavid van Moolenbroek
28*00b67f09SDavid van Moolenbroek #include <isc/once.h>
29*00b67f09SDavid van Moolenbroek #include <isc/assertions.h>
30*00b67f09SDavid van Moolenbroek #include <isc/util.h>
31*00b67f09SDavid van Moolenbroek
32*00b67f09SDavid van Moolenbroek isc_result_t
isc_once_do(isc_once_t * controller,void (* function)(void))33*00b67f09SDavid van Moolenbroek isc_once_do(isc_once_t *controller, void(*function)(void)) {
34*00b67f09SDavid van Moolenbroek REQUIRE(controller != NULL && function != NULL);
35*00b67f09SDavid van Moolenbroek
36*00b67f09SDavid van Moolenbroek if (controller->status == ISC_ONCE_INIT_NEEDED) {
37*00b67f09SDavid van Moolenbroek
38*00b67f09SDavid van Moolenbroek if (InterlockedDecrement(&controller->counter) == 0) {
39*00b67f09SDavid van Moolenbroek if (controller->status == ISC_ONCE_INIT_NEEDED) {
40*00b67f09SDavid van Moolenbroek function();
41*00b67f09SDavid van Moolenbroek controller->status = ISC_ONCE_INIT_DONE;
42*00b67f09SDavid van Moolenbroek }
43*00b67f09SDavid van Moolenbroek } else {
44*00b67f09SDavid van Moolenbroek while (controller->status == ISC_ONCE_INIT_NEEDED) {
45*00b67f09SDavid van Moolenbroek /*
46*00b67f09SDavid van Moolenbroek * Sleep(0) indicates that this thread
47*00b67f09SDavid van Moolenbroek * should be suspended to allow other
48*00b67f09SDavid van Moolenbroek * waiting threads to execute.
49*00b67f09SDavid van Moolenbroek */
50*00b67f09SDavid van Moolenbroek Sleep(0);
51*00b67f09SDavid van Moolenbroek }
52*00b67f09SDavid van Moolenbroek }
53*00b67f09SDavid van Moolenbroek }
54*00b67f09SDavid van Moolenbroek
55*00b67f09SDavid van Moolenbroek return (ISC_R_SUCCESS);
56*00b67f09SDavid van Moolenbroek }
57