1 files changed, 25 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/System/Buffers/IPinnable.cs b/src/System.Private.CoreLib/shared/System/Buffers/IPinnable.cs
new file mode 100644
index 000000000..623e716a0
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Buffers/IPinnable.cs
@@ -0,0 +1,25 @@
+// 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.
+
+namespace System.Buffers
+{
+    /// <summary>
+    /// Provides a mechanism for pinning and unpinning objects to prevent the GC from moving them.
+    /// </summary>
+    public interface IPinnable
+    {
+        /// <summary>
+        /// Call this method to indicate that the IPinnable object can not be moved by the garbage collector.
+        /// The address of the pinned object can be taken.
+        /// <param name="elementIndex">The offset to the element within the memory at which the returned <see cref="MemoryHandle"/> points to.</param>
+        /// </summary>
+        MemoryHandle Pin(int elementIndex);
+
+        /// <summary>
+        /// Call this method to indicate that the IPinnable object no longer needs to be pinned.
+        /// The garbage collector is free to move the object now.
+        /// </summary>
+        void Unpin();
+    }
+}