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//
// 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.
//
namespace System.Threading
{
public sealed class RegisteredWaitHandle : MarshalByRefObject
{
WaitHandle _waitObject;
WaitOrTimerCallback _callback;
TimeSpan _timeout;
object _state;
bool _executeOnlyOnce;
WaitHandle _finalEvent;
ManualResetEvent _cancelEvent;
int _callsInProcess;
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)
_callback (_state, (bool)timedOut);
lock (this)
{
_callsInProcess--;
if (_unregistered && _callsInProcess == 0 && _finalEvent != null)
NativeEventCalls.SetEvent_internal (_finalEvent.Handle);
}
}
public bool Unregister(WaitHandle waitObject)
{
lock (this)
{
if (_unregistered) return false;
_finalEvent = waitObject;
_unregistered = true;
_cancelEvent.Set();
return true;
}
}
#if ONLY_1_1
[MonoTODO]
~RegisteredWaitHandle() {
// FIXME
}
#endif
}
}
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