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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc.Async {
using System;
using System.Threading;
// used to synchronize access to a single-use consumable resource
internal sealed class SingleEntryGate {
private const int NOT_ENTERED = 0;
private const int ENTERED = 1;
private int _status;
// returns true if this is the first call to TryEnter(), false otherwise
public bool TryEnter() {
int oldStatus = Interlocked.Exchange(ref _status, ENTERED);
return (oldStatus == NOT_ENTERED);
}
}
}
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