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Extra info for Advances in Computer Simulation: Lectures Held at the Eötvös Summer School in Budapest, Hungary, 16–20 July 1996
Using time instead of timeout for fault-tolerance in distributed systems. ACM TOPLAS 6, 2 (April 1984), 254-280. , R. Shostak, and M. Pease. The Byzantine generals problem. ACM TOPLAS 4, 3 (July 1982), 382-401. [Liskov 85] Liskov, B. The Argus language and system. Distributed Systems----~ethods and Tools for Specification, Lecture Notes in Computer Science, Vol. 430. [Liskov & Ladin 86] Liskov, B. and R. Ladin. Highly-available distributed services and fault-tolerant distributed garbage collection.
A client transmits a release request to mutex simply by permitting B (logical clock or real-time clock) time units to pass. It is only to increase utilization of the shared resource that a client might use messages to transmit a release request to mutex before B time units have passed. 1. Assume that • all clients and state machine copies have (logical or real time) clocks synchronized to within F and • the election starts at time Strt anffthis is known to all clients and state machine copies. Using time, a client can cast a vote for a default by doing nothing; only when a client casts a vote different from its default do we require that it actually transmit a request message.
This problem could be prevented by restricting write client access to only certain memory locations-the state machine can enforce this. Including tests in commands is another way to design a state machine that cannot be corrupted by requests from faulty clients. 2, will execute a release command made by any client---even one that does not have access to the resource. Consequently, a faulty client could issue such a request and cause mutex to grant a second client access to the resource before 31 the first has relinquished access.