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/*
* Copyright (C) 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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 1.3 2000/02/03 23:08:11 halley Exp $ */
/* Principal Authors: DCL */
#include <windows.h>
#include <isc/once.h>
#include <isc/assertions.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) {
/*
* Spin wait.
*/
}
}
}
return (ISC_R_SUCCESS);
}
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