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,
26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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
42 WaitHandle _waitObject;
43 WaitOrTimerCallback _callback;
45 WaitHandle _finalEvent;
46 ManualResetEvent _cancelEvent;
49 bool _executeOnlyOnce;
52 internal RegisteredWaitHandle (WaitHandle waitObject, WaitOrTimerCallback callback, object state, TimeSpan timeout, bool executeOnlyOnce)
54 _waitObject = waitObject;
58 _executeOnlyOnce = executeOnlyOnce;
60 _cancelEvent = new ManualResetEvent (false);
62 _unregistered = false;
65 internal void Wait (object state)
69 _waitObject.SafeWaitHandle.DangerousAddRef (ref release);
71 WaitHandle[] waits = new WaitHandle[] {_waitObject, _cancelEvent};
73 int signal = WaitHandle.WaitAny (waits, _timeout, false);
78 ThreadPool.QueueUserWorkItem (new WaitCallback (DoCallBack), (signal == WaitHandle.WaitTimeout));
80 } while (!_unregistered && !_executeOnlyOnce);
86 if (_callsInProcess == 0 && _finalEvent != null)
87 NativeEventCalls.SetEvent (_finalEvent.SafeWaitHandle);
89 } catch (ObjectDisposedException) {
90 // Can happen if we called Unregister before we had time to execute Wait
95 _waitObject.SafeWaitHandle.DangerousRelease ();
99 private void DoCallBack (object timedOut)
102 if (_callback != null)
103 _callback (_state, (bool)timedOut);
108 if (_unregistered && _callsInProcess == 0 && _finalEvent != null)
109 NativeEventCalls.SetEvent (_finalEvent.SafeWaitHandle);
115 public bool Unregister(WaitHandle waitObject)
122 _finalEvent = waitObject;
123 _unregistered = true;