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diff --git a/Utils/src/Async/IAsyncExclusiveResource.cs b/Utils/src/Async/IAsyncExclusiveResource.cs
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+/*
+* Copyright (c) 2022 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Utils
+* File: IAsyncExclusiveResource.cs 
+*
+* IAsyncExclusiveResource.cs is part of VNLib.Utils which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Utils is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU General Public License as published
+* by the Free Software Foundation, either version 2 of the License,
+* or (at your option) any later version.
+*
+* VNLib.Utils is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
+* General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License 
+* along with VNLib.Utils. If not, see http://www.gnu.org/licenses/.
+*/
+
+using System.Threading.Tasks;
+using VNLib.Utils.Resources;
+
+namespace VNLib.Utils.Async
+{
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    public interface IAsyncExclusiveResource : IResource
+    {
+        /// <summary>
+        /// Releases the resource from use. Called when a <see cref="ExclusiveResourceHandle{T}"/> is disposed
+        /// </summary>
+        ValueTask ReleaseAsync();
+    }
+}
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