Communications of the ACM
Synchronization in a parallel-accessed data base
Communications of the ACM
Programming semantics for multiprogrammed computations
Communications of the ACM
Analysis of computer peripheral interference
ACM '67 Proceedings of the 1967 22nd national conference
Computer structures: Readings and examples (McGraw-Hill computer science series)
Computer structures: Readings and examples (McGraw-Hill computer science series)
An optimal algorithm for mutual exclusion in computer networks
Communications of the ACM
A proposal for certain process management and intercommunication primitives
ACM SIGOPS Operating Systems Review
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Implementations of the “Lock-Unlock” method of synchronizing processors in a multiprocessor system usually require uninterruptable, memory-pause type instructions. An interlock scheme called read-interlock, which does not require memory-pause instructions, has been developed for a dual DEC PDP-10 system with real-time requirements. The read-interlock method does require a special “read-interlock” instruction in the repertoire of the processors and a special “read-interlock” cycle in the repertoire of the memory modules.When a processor examines a “lock” (a memory location) with a read-interlock instruction, it will be interrupted if the lock was already set; examining a lock immediately sets it if it was not already set (this event sequence is a read-interlock cycle). Writing into a lock clears it.Having the processor interrupted upon encountering a set lock instead of branching is advantageous if the branch would have resulted in an effective interrupt.