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Annotation of embedaddon/ntp/lib/isc/win32/once.c, revision 1.1.1.1

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: }