1 /* 2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 3 * 4 * This Source Code Form is subject to the terms of the Mozilla Public 5 * License, v. 2.0. If a copy of the MPL was not distributed with this 6 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 7 * 8 * See the COPYRIGHT file distributed with this work for additional 9 * information regarding copyright ownership. 10 */ 11 12 #include <config.h> 13 14 #include <windows.h> 15 16 #include <isc/once.h> 17 #include <isc/assertions.h> 18 #include <isc/util.h> 19 20 isc_result_t isc_once_do(isc_once_t * controller,void (* function)(void))21isc_once_do(isc_once_t *controller, void(*function)(void)) { 22 REQUIRE(controller != NULL && function != NULL); 23 24 if (controller->status == ISC_ONCE_INIT_NEEDED) { 25 26 if (InterlockedDecrement(&controller->counter) == 0) { 27 if (controller->status == ISC_ONCE_INIT_NEEDED) { 28 function(); 29 controller->status = ISC_ONCE_INIT_DONE; 30 } 31 } else { 32 while (controller->status == ISC_ONCE_INIT_NEEDED) { 33 /* 34 * Sleep(0) indicates that this thread 35 * should be suspended to allow other 36 * waiting threads to execute. 37 */ 38 Sleep(0); 39 } 40 } 41 } 42 43 return (ISC_R_SUCCESS); 44 } 45