1 files changed, 41 insertions, 0 deletions
diff --git a/lib/isc/win32/os.c b/lib/isc/win32/os.c
new file mode 100644
index 0000000..19a992e
--- /dev/null
+++ b/lib/isc/win32/os.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <windows.h>
+
+#include <isc/os.h>
+
+static BOOL bInit = FALSE;
+static SYSTEM_INFO SystemInfo;
+
+static void
+initialize_action(void) {
+	if (bInit) {
+		return;
+	}
+
+	GetSystemInfo(&SystemInfo);
+	bInit = TRUE;
+}
+
+unsigned int
+isc_os_ncpus(void) {
+	long ncpus;
+	initialize_action();
+	ncpus = SystemInfo.dwNumberOfProcessors;
+	if (ncpus <= 0) {
+		ncpus = 1;
+	}
+
+	return ((unsigned int)ncpus);
+}