Backport.System.Threading.Lock 2.0.0

.NET 5.0 This package targets .NET 5.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. .NET Framework 3.5 This package targets .NET Framework 3.5. The package is compatible with this framework or higher.
There is a newer version of this package available.
See the version list below for details. 
dotnet add package Backport.System.Threading.Lock --version 2.0.0
                    


                    

                
NuGet\Install-Package Backport.System.Threading.Lock -Version 2.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Backport.System.Threading.Lock" Version="2.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Backport.System.Threading.Lock" Version="2.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Backport.System.Threading.Lock" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Backport.System.Threading.Lock --version 2.0.0
                    


                    

                
#r "nuget: Backport.System.Threading.Lock, 2.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Backport.System.Threading.Lock@2.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Backport.System.Threading.Lock&version=2.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Backport.System.Threading.Lock&version=2.0.0
                    


                            Install as a Cake Tool

Backport.System.Threading.Lock Backport.System.Threading.Lock

GitHub Workflow Status NuGet NuGet Codacy Grade Codecov

A micro-library that backports .NET 9.0+'s System.Threading.Lock to prior framework versions (from .NET Framework 3.5 up to .NET 8.0), providing as much backward compatibility as possible.

Usage (only if targeting frameworks prior to .NET 5.0)

Due to frameworks prior to .NET 5.0 supporting the notorious Thread.Abort, we cannot use the same System.Threading.Lock namespace or else the locks would not be hardened against thread aborts, so we need to use a creator method instead.

Remember to multi-target .NET 9.0 in your .csproj file as well in order to get the performance benefits of System.Threading.Lock.

Example:

<TargetFrameworks>netstandard2.0;net9.0</TargetFrameworks>

In your .csproj file, or ideally in your Directory.Build.props file to avoid doing it to all projects, do the following:

<ItemGroup>
  <Using Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net9.0'))" Alias="Lock" Include="System.Threading.Lock" />
  <Using Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net9.0'))" Alias="Lock" Include="Backport.System.Threading.Lock" />
  <Using Alias="LockFactory" Include="Backport.System.Threading.LockFactory" />
</ItemGroup>

Usage:

private readonly Lock _syncRoot = LockFactory.Create();

public void Foo()
{
    lock (_syncRoot)
    {
        // do something
    }
}

public void Bar()
{
    _syncRoot.Enter();
    // do something that cannot crash on a thread that cannot abort
    _syncRoot.Exit();
}

Use the Lock class the same way you would use System.Threading.Lock.

Usage (only if targeting .NET 5.0 or later)

Use this library the same way you would use System.Threading.Lock.

In order to get the performance benefits of System.Threading.Lock, you must however multi-target frameworks in your .csproj file.

Example:

<TargetFrameworks>net5.0;net9.0</TargetFrameworks>

There is also no need to reference this library as a dependency for .NET 9.0+. You can achieve that by having this in your .csproj file:

<ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net9.0'))">
  <PackageReference Include="Backport.System.Threading.Lock" Version="2.0.0" />  
</ItemGroup>

Performance

This library was benchmarked against locking on an object on .NET 8.0 and no speed or memory allocation difference was noted, whereas when .NET 9.0 was used the performance was ~25% better as opposed to locking on an object.

Credits

Check out our list of contributors!

Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 is compatible.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net35 is compatible.  net40 is compatible.  net403 was computed.  net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

  • .NETFramework 3.5

    • No dependencies.

  • .NETFramework 4.0

    • No dependencies.

  • .NETFramework 4.5

    • No dependencies.

  • .NETStandard 2.0

    • No dependencies.

  • net5.0

    • No dependencies.

  • net6.0

    • No dependencies.

  • net7.0

    • No dependencies.

  • net9.0

    • No dependencies.

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Version Downloads Last Updated
3.1.8 12,621 3/15/2026
3.1.6 4,229 2/10/2026
3.1.5 19,014 10/4/2025
3.1.4 83,524 12/16/2024
3.1.0 39,236 12/14/2024
2.0.0 3,003 9/7/2024
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Breaking change that requires different usage for projects targeting frameworks prior to .NET 5.0 in order to cater for potential thread aborts.