once.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
* Copyright (C) 1999-2001, 2004, 2007, 2016 Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/* $Id: once.c,v 1.12 2007/06/18 23:47:49 tbox Exp $ */
/* Principal Authors: DCL */
#include <config.h>
#include <windows.h>
#include <isc/once.h>
#include <isc/assertions.h>
#include <isc/util.h>
isc_result_t
isc_once_do(isc_once_t *controller, void(*function)(void)) {
REQUIRE(controller != NULL && function != NULL);
if (controller->status == ISC_ONCE_INIT_NEEDED) {
if (InterlockedDecrement(&controller->counter) == 0) {
if (controller->status == ISC_ONCE_INIT_NEEDED) {
function();
controller->status = ISC_ONCE_INIT_DONE;
}
} else {
while (controller->status == ISC_ONCE_INIT_NEEDED) {
/*
* Sleep(0) indicates that this thread
* should be suspended to allow other
* waiting threads to execute.
*/
Sleep(0);
}
}
}
return (ISC_R_SUCCESS);
}