cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence/*
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * Copyright (C) 1999-2001, 2004, 2007, 2016 Internet Systems Consortium, Inc. ("ISC")
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence *
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * This Source Code Form is subject to the terms of the Mozilla Public
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * License, v. 2.0. If a copy of the MPL was not distributed with this
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * file, You can obtain one at http://mozilla.org/MPL/2.0/.
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence */
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
ec5347e2c775f027573ce5648b910361aa926c01Automatic Updater/* $Id: once.c,v 1.12 2007/06/18 23:47:49 tbox Exp $ */
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence/* Principal Authors: DCL */
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
e35c1bb3ecd9a6597360b9160b397c8053af69bfDanny Mayer#include <config.h>
e35c1bb3ecd9a6597360b9160b397c8053af69bfDanny Mayer
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence#include <windows.h>
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence#include <isc/once.h>
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence#include <isc/assertions.h>
e35c1bb3ecd9a6597360b9160b397c8053af69bfDanny Mayer#include <isc/util.h>
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrenceisc_result_t
e76d4c91bfadf823f04dcca1c1c5bcc14c67671dAndreas Gustafssonisc_once_do(isc_once_t *controller, void(*function)(void)) {
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence REQUIRE(controller != NULL && function != NULL);
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence if (controller->status == ISC_ONCE_INIT_NEEDED) {
40f53fa8d9c6a4fc38c0014495e7a42b08f52481David Lawrence
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence if (InterlockedDecrement(&controller->counter) == 0) {
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence if (controller->status == ISC_ONCE_INIT_NEEDED) {
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence function();
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence controller->status = ISC_ONCE_INIT_DONE;
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence }
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence } else {
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence while (controller->status == ISC_ONCE_INIT_NEEDED) {
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence /*
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * Sleep(0) indicates that this thread
0c27b3fe77ac1d5094ba3521e8142d9e7973133fMark Andrews * should be suspended to allow other
f05a4bf2bfac3aaff0462560b2793cd99a85a297Mark Andrews * waiting threads to execute.
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence */
f05a4bf2bfac3aaff0462560b2793cd99a85a297Mark Andrews Sleep(0);
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence }
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence }
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence }
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence return (ISC_R_SUCCESS);
cb73e2bfacb60eed27a3e4940f6dbe0c0580fc18David Lawrence}