From ea648e70a989cca190cd7403fe892fd2dcc290b4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 5 May 2024 20:37:14 +0200
Subject: Adding upstream version 1:9.11.5.P4+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 lib/isc/win32/once.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 lib/isc/win32/once.c

(limited to 'lib/isc/win32/once.c')

diff --git a/lib/isc/win32/once.c b/lib/isc/win32/once.c
new file mode 100644
index 0000000..baf178d
--- /dev/null
+++ b/lib/isc/win32/once.c
@@ -0,0 +1,44 @@
+/*
+ * 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);
+}
-- 
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