C# shared memory classes for sharing data between processes (Array, Buffer and Circular Buffer)

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The SharedMemory class library provides a set of C# classes that utilise memory-mapped files for fast low-level inter-process communication (IPC) - specifically for sharing data between processes. Supports both .NET 4 and .NET 3.5.

This library was inspired by the following article: "Fast IPC Communication Using Shared Memory and InterlockedCompareExchange"


  • SharedMemory.SharedBuffer - an abstract base class that wraps a memory mapped file, exposing the read/write operations and implementing a small header to allow clients to open the shared buffer without knowing the size beforehand.
  • SharedMemory.BufferWithLocks - an abstract class that extends SharedMemory.SharedBuffer to provide simple read/write locking support through the use of EventWaitHandles.
  • SharedMemory.SharedArray - a simple generic array implementation utilising a shared memory buffer. Inherits from SharedMemory.BufferWithLocks to provide support for thread synchronisation.
  • SharedMemory.BufferReadWrite - provides read/write access to a shared memory buffer, with various overloads to support reading and writing structures, copying to and from IntPtr and so on. Inherits from SharedMemory.BufferWithLocks to provide support for thread synchronisation.
  • SharedMemory.CircularBuffer - lock-free FIFO circular buffer implementation (aka ring buffer). Supporting 2 or more nodes, this implementation supports multiple readers and writers. The lock-free approach is implemented using Interlocked.Exchange and EventWaitHandles as explained here.
  • SharedMemory.FastStructure - provides a method of fast generic structure reading/writing using generated IL with DynamicMethod.

Usage examples can be found on the documentation page.

Available on NuGet.

Last edited Jul 25 at 10:56 AM by spazzarama, version 11