2 // System.Threading.RegisteredWaitHandle.cs
5 // Dick Porter (dick@ximian.com)
6 // Lluis Sanchez Gual (lluis@ideary.com)
8 // (C) Ximian, Inc. http://www.ximian.com
12 // Copyright (C) 2004, 2005 Novell, Inc (http://www.novell.com)
14 // Permission is hereby granted, free of charge, to any person obtaining
15 // a copy of this software and associated documentation files (the
16 // "Software"), to deal in the Software without restriction, including
17 // without limitation the rights to use, copy, modify, merge, publish,
18 // distribute, sublicense, and/or sell copies of the Software, and to
19 // permit persons to whom the Software is furnished to do so, subject to
20 // the following conditions:
22 // The above copyright notice and this permission notice shall be
23 // included in all copies or substantial portions of the Software.
25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
34 using System.Runtime.InteropServices;
36 namespace System.Threading
39 public sealed class RegisteredWaitHandle : MarshalByRefObject
41 WaitHandle _waitObject;
42 WaitOrTimerCallback _callback;
45 bool _executeOnlyOnce;
46 WaitHandle _finalEvent;
47 ManualResetEvent _cancelEvent;
51 internal RegisteredWaitHandle (WaitHandle waitObject, WaitOrTimerCallback callback, object state, TimeSpan timeout, bool executeOnlyOnce)
53 _waitObject = waitObject;
57 _executeOnlyOnce = executeOnlyOnce;
59 _cancelEvent = new ManualResetEvent (false);
61 _unregistered = false;
64 internal void Wait (object state)
68 WaitHandle[] waits = new WaitHandle[] {_waitObject, _cancelEvent};
71 int signal = WaitHandle.WaitAny (waits, _timeout, false);
74 lock (this) { _callsInProcess++; }
75 ThreadPool.QueueUserWorkItem (new WaitCallback (DoCallBack), (signal == WaitHandle.WaitTimeout));
78 while (!_unregistered && !_executeOnlyOnce);
84 if (_callsInProcess == 0 && _finalEvent != null)
85 NativeEventCalls.SetEvent_internal (_finalEvent.Handle);
89 private void DoCallBack (object timedOut)
91 if (_callback != null)
92 _callback (_state, (bool)timedOut);
97 if (_unregistered && _callsInProcess == 0 && _finalEvent != null)
98 NativeEventCalls.SetEvent_internal (_finalEvent.Handle);
103 public bool Unregister(WaitHandle waitObject)
107 if (_unregistered) return false;
108 _finalEvent = waitObject;
109 _unregistered = true;
117 ~RegisteredWaitHandle() {