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-rw-r--r--lib/isc/win32/once.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/isc/win32/once.c b/lib/isc/win32/once.c
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+++ b/lib/isc/win32/once.c
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <config.h>
+
+#include <windows.h>
+
+#include <isc/once.h>
+#include <isc/assertions.h>
+#include <isc/util.h>
+
+isc_result_t
+isc_once_do(isc_once_t *controller, void(*function)(void)) {
+ REQUIRE(controller != NULL && function != NULL);
+
+ if (controller->status == ISC_ONCE_INIT_NEEDED) {
+
+ if (InterlockedDecrement(&controller->counter) == 0) {
+ if (controller->status == ISC_ONCE_INIT_NEEDED) {
+ function();
+ controller->status = ISC_ONCE_INIT_DONE;
+ }
+ } else {
+ while (controller->status == ISC_ONCE_INIT_NEEDED) {
+ /*
+ * Sleep(0) indicates that this thread
+ * should be suspended to allow other
+ * waiting threads to execute.
+ */
+ Sleep(0);
+ }
+ }
+ }
+
+ return (ISC_R_SUCCESS);
+}