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Annotation of embedaddon/ntp/lib/isc/win32/once.c, revision 1.1

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