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/*
* Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $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);
}
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