A Type System for Unstructured Locking that Guarantees Deadlock Freedom without Imposing a Lock Ordering

preprint2011arXivOpen access

Abstract

Deadlocks occur in concurrent programs as a consequence of cyclic resource acquisition between threads. In this paper we present a novel type system that guarantees deadlock freedom for a language with references, unstructured locking primitives, and locks which are implicitly associated with references. The proposed type system does not impose a strict lock acquisition order and thus increases programming language expressiveness.

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