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55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*
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* Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: once.c,v 1.12 2007/06/18 23:47:49 tbox Exp $ */
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/* Principal Authors: DCL */
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#include <config.h>
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#include <windows.h>
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#include <isc/once.h>
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#include <isc/assertions.h>
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#include <isc/util.h>
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isc_result_t
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isc_once_do(isc_once_t *controller, void(*function)(void)) {
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REQUIRE(controller != NULL && function != NULL);
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if (controller->status == ISC_ONCE_INIT_NEEDED) {
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if (InterlockedDecrement(&controller->counter) == 0) {
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if (controller->status == ISC_ONCE_INIT_NEEDED) {
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function();
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controller->status = ISC_ONCE_INIT_DONE;
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}
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} else {
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while (controller->status == ISC_ONCE_INIT_NEEDED) {
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/*
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* Sleep(0) indicates that this thread
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* should be suspended to allow other
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* waiting threads to execute.
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*/
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Sleep(0);
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}
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}
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}
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return (ISC_R_SUCCESS);
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}
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