Saturation of Concurrent Collapsible Pushdown Systems
نویسنده
چکیده
Multi-stack pushdown systems are a well-studied model of concurrent computationusing threads with first-order procedure calls. While, in general, reachability is unde-cidable, there are numerous restrictions on stack behaviour that lead to decidability.To model higher-order procedures calls, a generalisation of pushdown stacks called col-lapsible pushdown stacks are required. Reachability problems for multi-stack collapsiblepushdown systems have been little studied. Here, we study ordered, phase-bounded andscope-bounded multi-stack collapsible pushdown systems using saturation techniques,showing decidability of control state reachability and giving a regular representation ofall configurations that can reach a given control state.
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