Lockless-Queue 1.1.0

.NET Standard 2.0
There is a newer version of this package available.
See the version list below for details.
dotnet add package Lockless-Queue --version 1.1.0
NuGet\Install-Package Lockless-Queue -Version 1.1.0
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="Lockless-Queue" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Lockless-Queue --version 1.1.0
#r "nuget: Lockless-Queue, 1.1.0"
#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.
// Install Lockless-Queue as a Cake Addin
#addin nuget:?package=Lockless-Queue&version=1.1.0

// Install Lockless-Queue as a Cake Tool
#tool nuget:?package=Lockless-Queue&version=1.1.0


A collection of concurrent collections.

Available on NuGet via Install-Package Lockless-Queue

The following collections are present:

  • ConcurrentHashSet (based on .Net ConcurrentDictionary)
  • SPSC Queue (Single Producer, Single Consumer).
  • MPSC Queue (Multi Producer, Single Consumer).
  • Concurrent Queue (Multi Producer, Multi Consumer).

The Concurrent Queue implementation is a copy of the .Net 5.0 implementation with the added option for a fixed-size queue. This queue is lockless if/when it is instantiated as a fixed-size queue.


All benchmarks are run in a .Net 5.0 environment.


SysConcurrentQueue and Queue are the built-in .Net types. Where possible, a fixed-size queue has been used.

The following Benchmarks execute Enqueueing 128 items, Dequeueing 128 items and finally clearing the Queue. The same methods are used for each queue where available. All Queue benchmarks are run in a single-threaded environment to demonstrate the "raw" throughput of each queue.

Method Mean Error StdDev Gen 0 Gen 1 Gen 2 Allocated
ConcurrentQueue 2,473.3 ns 2.27 ns 2.01 ns - - - -
SysConcurrentQueue 2,860.0 ns 16.30 ns 15.24 ns 0.5188 0.0076 - 4352 B
MPSCQueue 1,612.5 ns 1.87 ns 1.75 ns - - - -
SPSCQueue 562.1 ns 4.05 ns 3.78 ns - - - -
Queue 612.5 ns 1.33 ns 1.24 ns - - - -


A comparison is made between the ConcurrentDictionary (when using a byte as value) and the ConcurrentHashSet implementation. The following benchmarks execute TryAdd 128 items, TryRemove 128 items and finally clearing the collection. The benchmarks are run in a single-threaded environment.

Method Mean Error StdDev Gen 0 Gen 1 Gen 2 Allocated
ConcurrentDictionary 60.580 μs 0.0796 μs 0.0621 μs 3.6621 0.0610 - 30.14 KB
ConcurrentHashSet 7.990 μs 0.0104 μs 0.0087 μs 0.6104 - - 5 KB
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  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 was computed.  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. 
.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 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)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

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Version Downloads Last updated
1.1.1 450 12/5/2021
1.1.0 241 12/3/2021
1.0.2 290 3/4/2021
1.0.1 298 2/3/2021
1.0.0 311 1/30/2021

Added ConcurrentHashSet