From 080f1697e97e13461ec6df4d31c8924d01257a1b Mon Sep 17 00:00:00 2001 From: Roy Ben Shabat Date: Tue, 9 Apr 2019 01:47:48 +0300 Subject: MERGE --- .../Utils/CallbackOnDispose.cs | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/CallbackOnDispose.cs (limited to 'Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/CallbackOnDispose.cs') diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/CallbackOnDispose.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/CallbackOnDispose.cs new file mode 100644 index 000000000..a6eebf2f1 --- /dev/null +++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/CallbackOnDispose.cs @@ -0,0 +1,35 @@ +// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt) +// This code is distributed under the GNU LGPL (for details please see \doc\license.txt) + +using System; +using System.Diagnostics; +using System.Threading; + +namespace Tango.Scripting.Editors.Utils +{ + /// + /// Invokes an action when it is disposed. + /// + /// + /// This class ensures the callback is invoked at most once, + /// even when Dispose is called on multiple threads. + /// + sealed class CallbackOnDispose : IDisposable + { + Action action; + + public CallbackOnDispose(Action action) + { + Debug.Assert(action != null); + this.action = action; + } + + public void Dispose() + { + Action a = Interlocked.Exchange(ref action, null); + if (a != null) { + a(); + } + } + } +} -- cgit v1.3.1