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Guarded commands, nondeterminacy and formal derivation of programs

1975; Association for Computing Machinery; Volume: 18; Issue: 8 Linguagem: Inglês

10.1145/360933.360975

1557-7317

Edsger W. Dijkstra,

Parallel Computing and Optimization Techniques

So-called “guarded commands” are introduced as a building block for alternative and repetitive constructs that allow nondeterministic program components for which at least the activity evoked, but possibly even the final state, is not necessarily uniquely determined by the initial state. For the formal derivation of programs expressed in terms of these constructs, a calculus will be be shown.