1 files changed, 22 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/Interop/Windows/Kernel32/Interop.Semaphore.cs b/src/System.Private.CoreLib/shared/Interop/Windows/Kernel32/Interop.Semaphore.cs
new file mode 100644
index 000000000..94648a707
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/Interop/Windows/Kernel32/Interop.Semaphore.cs
@@ -0,0 +1,22 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.Win32.SafeHandles;
+using System;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class Kernel32
+    {
+        [DllImport(Interop.Libraries.Kernel32, EntryPoint = "OpenSemaphoreW", SetLastError = true, CharSet = CharSet.Unicode)]
+        internal static extern SafeWaitHandle OpenSemaphore(uint desiredAccess, bool inheritHandle, string name);
+        
+        [DllImport(Libraries.Kernel32, EntryPoint = "CreateSemaphoreExW", SetLastError = true, CharSet = CharSet.Unicode)]
+        internal static extern SafeWaitHandle CreateSemaphoreEx(IntPtr lpSecurityAttributes, int initialCount, int maximumCount, string name, uint flags, uint desiredAccess);
+
+        [DllImport(Interop.Libraries.Kernel32, SetLastError = true)]
+        internal static extern bool ReleaseSemaphore(SafeWaitHandle handle, int releaseCount, out int previousCount);
+    }
+}