97 lines
3.4 KiB
C#
97 lines
3.4 KiB
C#
// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Threading;
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namespace SharpDX
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{
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/// <summary>
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/// Callback base implementation of <see cref="ICallbackable"/>.
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/// </summary>
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public abstract class CallbackBase : DisposeBase, ICallbackable
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{
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private int refCount = 1;
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources
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/// </summary>
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/// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected override void Dispose(bool disposing)
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{
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if (disposing)
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{
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Release();
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}
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}
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public int AddReference()
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{
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var old = refCount;
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while (true)
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{
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if (old == 0)
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{
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throw new ObjectDisposedException("Cannot add a reference to a nonreferenced item");
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}
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var current = Interlocked.CompareExchange(ref refCount, old + 1, old);
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if (current == old)
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{
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return old + 1;
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}
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old = current;
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}
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}
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public int Release()
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{
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var old = refCount;
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while (true)
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{
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var current = Interlocked.CompareExchange(ref refCount, old - 1, old);
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if (current == old)
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{
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if (old == 1)
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{
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// Dispose native resources
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var callback = ((ICallbackable)this);
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callback.Shadow.Dispose();
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callback.Shadow = null;
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}
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return old - 1;
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}
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old = current;
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}
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}
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public Result QueryInterface(ref Guid guid, out IntPtr comObject)
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{
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var container = (ShadowContainer)((ICallbackable)this).Shadow;
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comObject = container.Find(guid);
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if (comObject == IntPtr.Zero)
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{
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return Result.NoInterface;
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}
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return Result.Ok;
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}
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IDisposable ICallbackable.Shadow { get; set; }
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}
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} |