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The combination of message passing and locking to protect shared state is a useful concurrency pattern. However, programs that employ this pattern are susceptible to deadlock. That is, the execution may reach a state where each thread in a set waits for another thread in that set to release a lock or send a message. This paper proposes a modular verification technique that prevents deadlocks in programs that use both message passing and locking. The approach prevents deadlocks by enforcing two rules: (0) a blocking receive is allowed only if another thread holds an obligation to send and (1) each thread must perform acquire and receive operations in accordance with a global order.
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