+++ /dev/null
-//
-// System.Threading.RegisteredWaitHandle.cs
-//
-// Author:
-// Dick Porter (dick@ximian.com)
-// Lluis Sanchez Gual (lluis@ideary.com)
-//
-// (C) Ximian, Inc. http://www.ximian.com
-//
-
-//
-// Copyright (C) 2004, 2005 Novell, Inc (http://www.novell.com)
-//
-// Permission is hereby granted, free of charge, to any person obtaining
-// a copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to
-// permit persons to whom the Software is furnished to do so, subject to
-// the following conditions:
-//
-// The above copyright notice and this permission notice shall be
-// included in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-//
-
-using System.Runtime.InteropServices;
-
-namespace System.Threading
-{
- [ComVisible (true)]
- public sealed class RegisteredWaitHandle
- : MarshalByRefObject
- {
- WaitHandle _waitObject;
- WaitOrTimerCallback _callback;
- object _state;
- WaitHandle _finalEvent;
- ManualResetEvent _cancelEvent;
- TimeSpan _timeout;
- int _callsInProcess;
- bool _executeOnlyOnce;
- bool _unregistered;
-
- internal RegisteredWaitHandle (WaitHandle waitObject, WaitOrTimerCallback callback, object state, TimeSpan timeout, bool executeOnlyOnce)
- {
- _waitObject = waitObject;
- _callback = callback;
- _state = state;
- _timeout = timeout;
- _executeOnlyOnce = executeOnlyOnce;
- _finalEvent = null;
- _cancelEvent = new ManualResetEvent (false);
- _callsInProcess = 0;
- _unregistered = false;
- }
-
- internal void Wait (object state)
- {
- try
- {
- WaitHandle[] waits = new WaitHandle[] {_waitObject, _cancelEvent};
- do
- {
- int signal = WaitHandle.WaitAny (waits, _timeout, false);
- if (!_unregistered)
- {
- lock (this) { _callsInProcess++; }
- ThreadPool.QueueUserWorkItem (new WaitCallback (DoCallBack), (signal == WaitHandle.WaitTimeout));
- }
- }
- while (!_unregistered && !_executeOnlyOnce);
- }
- catch {}
-
- lock (this) {
- _unregistered = true;
- if (_callsInProcess == 0 && _finalEvent != null)
- NativeEventCalls.SetEvent_internal (_finalEvent.Handle);
- }
- }
-
- private void DoCallBack (object timedOut)
- {
- if (_callback != null) {
- try {
- _callback (_state, (bool)timedOut);
- } catch {}
- }
-
- lock (this)
- {
- _callsInProcess--;
- if (_unregistered && _callsInProcess == 0 && _finalEvent != null)
- NativeEventCalls.SetEvent_internal (_finalEvent.Handle);
- }
- }
-
- [ComVisible (true)]
- public bool Unregister(WaitHandle waitObject)
- {
- lock (this)
- {
- if (_unregistered) return false;
- _finalEvent = waitObject;
- _unregistered = true;
- _cancelEvent.Set();
- return true;
- }
- }
-
- }
-}