A language and toolkit for building, analyzing, systematically testing and debugging asynchronous reactive software, such as web-services and distributed systems.

The P# framework provides:

• Language extensions to C# for building event-driven asynchronous applications, writing test harnesses, and specifying safety and liveness properties.
• A systematic testing engine that can capture and control all specified nondeterminism in the system, systematically explore the actual executable code to discover bugs, and report bug traces. A P# bug trace provides a global order of all communication events, and thus is easier to debug.
• Support for replaying bug traces, and debugging them using the Visual Studio debugger.

Although P# primarily targets .NET, it has also experimental support for systematically testing native C++ code.

The best way to build and start using P# is to read our wiki.

You can also read the manual and available publications:

• Manual
• Publications

We welcome contributions! However, before you start contributing, please read carefully the development guidelines.

If you would like to use P# in your project, or have any specific questions, please feel free to contact one of the following members of the P# team (@p-org/psharp-developers):

• Akash Lal ([email protected])
• Rashmi Mudduluru ([email protected])
• Pantazis Deligiannis ([email protected])
• Shaz Qadeer ([email protected])
• Cheng Huang ([email protected])