54 lines
1.7 KiB
C#
54 lines
1.7 KiB
C#
// <copyright file="NestableReadLock.cs" company="Moonfire Games">
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// Copyright (c) Moonfire Games.
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// This code is licensed under the MIT license.
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// See LICENSE.md in the source or https://opensource.org/licenses/MIT
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// </copyright>
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namespace MfGames.Locking
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{
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using System;
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using System.Threading;
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/// <summary>
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/// Defines a ReaderWriterLockSlim read-only lock.
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/// </summary>
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public class NestableReadLock : IDisposable
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{
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private readonly bool lockAcquired;
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private readonly ReaderWriterLockSlim readerWriterLockSlim;
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/// <summary>
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/// Initializes a new instance of the <see cref="NestableReadLock" /> class.
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/// </summary>
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/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
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public NestableReadLock(ReaderWriterLockSlim readerWriterLockSlim)
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{
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// Keep track of the lock since we'll need it to release the lock.
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this.readerWriterLockSlim = readerWriterLockSlim;
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// If we already have a read or write lock, we don't do anything.
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if (readerWriterLockSlim.IsReadLockHeld
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|| readerWriterLockSlim.IsUpgradeableReadLockHeld
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|| readerWriterLockSlim.IsWriteLockHeld)
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{
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this.lockAcquired = false;
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}
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else
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{
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readerWriterLockSlim.EnterReadLock();
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this.lockAcquired = true;
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}
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}
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/// <inheritdoc />
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public void Dispose()
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{
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if (this.lockAcquired)
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{
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this.readerWriterLockSlim.ExitReadLock();
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}
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}
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}
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}
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