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// CountdownEvent.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
// Copyright 2011 Xamarin Inc (http://www.xamarin.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
{
[System.Diagnostics.DebuggerDisplayAttribute ("Initial Count={InitialCount}, Current Count={CurrentCount}")]
public class CountdownEvent : IDisposable
{
int initialCount;
int initial;
ManualResetEventSlim evt;
public CountdownEvent (int initialCount)
{
if (initialCount < 0)
throw new ArgumentOutOfRangeException ("initialCount");
evt = new ManualResetEventSlim (initialCount == 0);
this.initial = this.initialCount = initialCount;
}
public int CurrentCount {
get {
return initialCount;
}
}
public int InitialCount {
get {
return initial;
}
}
public bool IsSet {
get {
return initialCount == 0;
}
}
public WaitHandle WaitHandle {
get {
return evt.WaitHandle;
}
}
public bool Signal ()
{
return Signal (1);
}
public bool Signal (int signalCount)
{
if (signalCount <= 0)
throw new ArgumentOutOfRangeException ("signalCount");
CheckDisposed ();
int newValue;
if (!ApplyOperation (-signalCount, out newValue))
throw new InvalidOperationException ("The event is already set");
if (newValue == 0) {
evt.Set ();
return true;
}
return false;
}
public void AddCount ()
{
AddCount (1);
}
public void AddCount (int signalCount)
{
if (!TryAddCount (signalCount))
throw new InvalidOperationException ("The event is already signaled and cannot be incremented");
}
public bool TryAddCount ()
{
return TryAddCount (1);
}
public bool TryAddCount (int signalCount)
{
if (signalCount <= 0)
throw new ArgumentOutOfRangeException ("signalCount");
CheckDisposed ();
int temp;
return ApplyOperation (signalCount, out temp);
}
bool ApplyOperation (int num, out int newValue)
{
int oldCount;
do {
oldCount = initialCount;
if (oldCount == 0) {
newValue = 0;
return false;
}
newValue = oldCount + num;
if (newValue < 0)
return false;
} while (Interlocked.CompareExchange (ref initialCount, newValue, oldCount) != oldCount);
return true;
}
public void Wait ()
{
evt.Wait ();
}
public void Wait (CancellationToken cancellationToken)
{
evt.Wait (cancellationToken);
}
public bool Wait (int millisecondsTimeout)
{
return evt.Wait (millisecondsTimeout);
}
public bool Wait(TimeSpan timeout)
{
return evt.Wait (timeout);
}
public bool Wait (int millisecondsTimeout, CancellationToken cancellationToken)
{
return evt.Wait (millisecondsTimeout, cancellationToken);
}
public bool Wait(TimeSpan timeout, CancellationToken cancellationToken)
{
return evt.Wait (timeout, cancellationToken);
}
public void Reset ()
{
Reset (initial);
}
public void Reset (int count)
{
if (count < 0)
throw new ArgumentOutOfRangeException ("count");
CheckDisposed ();
initialCount = initial = count;
if (count == 0)
evt.Set ();
else
evt.Reset ();
}
public void Dispose ()
{
Dispose (true);
}
protected virtual void Dispose (bool disposing)
{
if (disposing)
evt.Dispose ();
}
void CheckDisposed ()
{
if (evt.disposed.Value)
throw new ObjectDisposedException ("CountdownEvent");
}
}
}
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