Timed Multiparty Session Types

We propose a typing theory, based on multiparty session types, for modular verification of real-time choreographic interactions. To model real-time implementations, we introduce a simple calculus with delays and a decidable static proof system. The proof system with time constraints ensures type safety and time-error freedom, namely processes respect the prescribed timing and causalities between interactions. A decidable condition, enforceable on timed global types, guarantees global time-progress for validated processes with delays, and gives a sound and complete characterisation of a new class of CTAs with general topologies that enjoys global progress and liveness.