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This commit is contained in:
Dylan R. E. Moonfire 2018-01-18 16:16:01 -06:00
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MIT License
Copyright (c) Moonfire Games
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.

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
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MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MfGames.Locking", "MfGames.Locking\MfGames.Locking.csproj", "{51E00BEF-AAF1-4D45-BF82-5DCD7D5EA7FC}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
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MfGames.Locking/MfGames.Locking.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFrameworks>net452;net461;netstandard1.6;netstandard2.0;netcoreapp2.0</TargetFrameworks>
<PackageId>MfGames.Locking</PackageId>
<PackageVersion>5.0.0</PackageVersion>
<Authors>Dylan R. E. Moonfire</Authors>
<Description>Various locking patterns for multi-threaded code.</Description>
<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
<Copyright>Copyright (c) Moonfire Games. MIT license.</Copyright>
<PackageTags>lock; locking</PackageTags>
<PackageLicenseUrl>https://opensource.org/licenses/MIT</PackageLicenseUrl>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<DocumentationFile>bin\Debug\netcoreapp2.0\MfGames.Locking.xml</DocumentationFile>
<GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
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</ItemGroup>
</Project>

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

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

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

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// <copyright file="ReadLock.cs" company="Moonfire Games">
// Copyright (c) Moonfire Games.
// This code is licensed under the MIT license.
// See LICENSE.md in the source or https://opensource.org/licenses/MIT
// </copyright>
namespace MfGames.Locking
{
using System;
using System.Threading;
/// <inheritdoc />
/// <summary>
/// Defines a ReaderWriterLockSlim read-only lock.
/// </summary>
public class ReadLock : IDisposable
{
private readonly ReaderWriterLockSlim readerWriterLockSlim;
/// <summary>
/// Initializes a new instance of the <see cref="ReadLock" /> class.
/// </summary>
/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
public ReadLock(ReaderWriterLockSlim readerWriterLockSlim)
{
this.readerWriterLockSlim = readerWriterLockSlim;
readerWriterLockSlim.EnterReadLock();
}
/// <inheritdoc />
public void Dispose()
{
this.readerWriterLockSlim.ExitReadLock();
}
}
}

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// <copyright file="TryGetCreate.cs" company="Moonfire Games">
// Copyright (c) Moonfire Games.
// This code is licensed under the MIT license.
// See LICENSE.md in the source or https://opensource.org/licenses/MIT
// </copyright>
namespace MfGames.Locking
{
using System;
using System.Threading;
/// <summary>
/// Implements the basic pattern for getting an item from a cache using
/// the ReaderWriterLockSlim class. This attempts to get it using a read-only
/// lock. If that fails, it gets an upgradable lock, tries again, and if it
/// still can't find it, upgrades the lock to a write lock to create it.
/// </summary>
public static class TryGetCreate
{
/// <summary>
/// Invokes the try/get/create pattern used a condition to test for it
/// and a constructor function.
/// </summary>
/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
/// <param name="conditionHandler">The condition handler.</param>
/// <param name="createHandler">The create handler.</param>
public static void Invoke(
ReaderWriterLockSlim readerWriterLockSlim,
Func<bool> conditionHandler,
Action createHandler)
{
using (new ReadLock(readerWriterLockSlim))
{
// Verify that the condition for creating it is false.
if (!conditionHandler())
{
return;
}
}
// We failed to get the lock using the read-only. We create an upgradable lock
// and try again since it may have been created with a race condition when the
// last lock was released and this one was acquired.
using (new UpgradableLock(readerWriterLockSlim))
{
// Verify that the condition for creating it is false.
if (!conditionHandler())
{
return;
}
// We failed to get it in the lock. Upgrade the lock to a write and create it.
using (new WriteLock(readerWriterLockSlim))
{
createHandler();
}
}
}
/// <summary>
/// Invokes the try/get/create pattern using a tryget retrieval and a
/// creator handler.
/// </summary>
/// <typeparam name="TInput">The type of the input.</typeparam>
/// <typeparam name="TOutput">The type of the output.</typeparam>
/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
/// <param name="input">The input.</param>
/// <param name="tryGetHandler">The try get handler.</param>
/// <param name="createHandler">The create handler.</param>
/// <returns>The requested output object.</returns>
public static TOutput Invoke<TInput, TOutput>(
ReaderWriterLockSlim readerWriterLockSlim,
TInput input,
TryGetHandler<TInput, TOutput> tryGetHandler,
Func<TInput, TOutput> createHandler)
{
// First attempt to get the item using a read-only lock.
TOutput output;
using (new ReadLock(readerWriterLockSlim))
{
// Try to get the item using the try/get handler.
if (tryGetHandler(input, out output))
{
// We successful got the item in the read-only cache, so just return it.
return output;
}
}
// We failed to get the lock using the read-only. We create an upgradable lock
// and try again since it may have been created with a race condition when the
// last lock was released and this one was acquired.
using (new UpgradableLock(readerWriterLockSlim))
{
// Try to get the item using the try/get handler.
if (tryGetHandler(input, out output))
{
// We successful got the item in this lock, so return it without
// upgrading the lock.
return output;
}
// We failed to get it in the lock. Upgrade the lock to a write and create it.
using (new WriteLock(readerWriterLockSlim))
{
return createHandler(input);
}
}
}
}
}

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// <copyright file="TryGetHandler.cs" company="Moonfire Games">
// Copyright (c) Moonfire Games.
// This code is licensed under the MIT license.
// See LICENSE.md in the source or https://opensource.org/licenses/MIT
// </copyright>
namespace MfGames.Locking
{
/// <summary>
/// Defines the common try/get handler to retrieve an item of a given type.
/// </summary>
/// <typeparam name="TInput">The type of the input or lookup key.</typeparam>
/// <typeparam name="TOutput">The type of the output.</typeparam>
/// <param name="input">The input value to search for.</param>
/// <param name="output">The resulting output value.</param>
/// <returns>True if the attempt was successful, otherwise false.</returns>
public delegate bool TryGetHandler<in TInput, TOutput>(
TInput input,
out TOutput output);
}

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MfGames.Locking/UpgradableLock.cs Normal file
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// <copyright file="UpgradableLock.cs" company="Moonfire Games">
// Copyright (c) Moonfire Games.
// This code is licensed under the MIT license.
// See LICENSE.md in the source or https://opensource.org/licenses/MIT
// </copyright>
namespace MfGames.Locking
{
using System;
using System.Threading;
/// <summary>
/// Defines a ReaderWriterLockSlim read-only lock.
/// </summary>
public class UpgradableLock : IDisposable
{
private readonly ReaderWriterLockSlim readerWriterLockSlim;
/// <summary>
/// Initializes a new instance of the <see cref="UpgradableLock" /> class.
/// </summary>
/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
public UpgradableLock(ReaderWriterLockSlim readerWriterLockSlim)
{
this.readerWriterLockSlim = readerWriterLockSlim;
readerWriterLockSlim.EnterUpgradeableReadLock();
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
this.readerWriterLockSlim.ExitUpgradeableReadLock();
}
}
}

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MfGames.Locking/WriteLock.cs Normal file
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// <copyright file="WriteLock.cs" company="Moonfire Games">
// Copyright (c) Moonfire Games.
// This code is licensed under the MIT license.
// See LICENSE.md in the source or https://opensource.org/licenses/MIT
// </copyright>
namespace MfGames.Locking
{
using System;
using System.Threading;
/// <summary>
/// Defines a ReaderWriterLockSlim read-only lock.
/// </summary>
public class WriteLock : IDisposable
{
private readonly ReaderWriterLockSlim readerWriterLockSlim;
/// <summary>
/// Initializes a new instance of the <see cref="WriteLock" /> class.
/// </summary>
/// <param name="readerWriterLockSlim">The reader writer lock slim.</param>
public WriteLock(ReaderWriterLockSlim readerWriterLockSlim)
{
this.readerWriterLockSlim = readerWriterLockSlim;
readerWriterLockSlim.EnterWriteLock();
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
this.readerWriterLockSlim.ExitWriteLock();
}
}
}

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{
"$schema":
"https://raw.githubusercontent.com/DotNetAnalyzers/StyleCopAnalyzers/master/StyleCop.Analyzers/StyleCop.Analyzers/Settings/stylecop.schema.json",
"settings": {
"documentationRules": {
"companyName": "Moonfire Games",
"copyrightText":
"Copyright (c) {companyName}.\nThis code is licensed under the MIT license.\nSee LICENSE.md in the source or https://opensource.org/licenses/MIT"
}
}
}

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README.md Normal file
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MfGames.Locking CIL
===================
This a small collection of classes that provide some simplification while working with locking in C# applications.
```
//using MfGames.Locking;
ReaderWriterLockSlim locker;
using (new ReadLock(locker))
{
// Do something.
}
```