GithubWorkflowTool/tlaplus

TLA+ Specifications

This directory contains TLA+ formal specifications for the GithubWorkflowTool project.

About TLA+

TLA+ is a formal specification language developed by Leslie Lamport for designing, modeling, documenting, and verifying concurrent systems and algorithms. It's particularly useful for:

• Modeling distributed systems and concurrent processes
• Verifying correctness properties
• Finding subtle bugs in system designs
• Documenting system behavior formally

Purpose

The TLA+ specifications in this directory formally model key components of the GithubWorkflowTool, including:

• Workflow execution semantics
• Job dependency resolution
• Concurrent job execution
• State transitions in the workflow engine
• Cache and artifact management

Tools

To work with TLA+ specifications, you'll need:

• TLA+ Toolbox: The IDE for TLA+ (https://lamport.azurewebsites.net/tla/toolbox.html)
• TLC Model Checker: For checking specifications (included with the Toolbox)
• TLAPS: The TLA+ Proof System (optional, for formal proofs)

File Structure

TLA+ specification files typically have the .tla extension. Each specification may include:

• Module definitions
• Constants and variables
• Initial state predicates
• Next-state actions
• Invariants and temporal properties

Resources

• TLA+ Homepage
• Learn TLA+
• TLA+ Examples
• Specifying Systems Book