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Dependable, Autonomic and Secure Computing, IEEE International Symposium on (2009)
Chengdu, China
Dec. 12, 2009 to Dec. 14, 2009
ISBN: 978-0-7695-3929-4
pp: 31-36
On shared memory multiprocessors, synchronization often turns out to be a performance bottleneck and the source of poor fault-tolerance. By avoiding locks, the significant benefit of lock (or wait)-freedom for real-time systems is that the potentials for deadlock and priority inversion are avoided. The lock-free algorithms often require the use of special atomic processor primitives such as CAS (Compare And Swap) or LL /SC (Load Linked/Store Conditional). However, many machine architectures support either CAS or LL /SC , but not both. In this paper, we present a lock-free implementation of the ideal semantics of LL /SC using only pointer-size CAS , and show how to use refinement mapping to prove the correctness of the algorithm.
Lock-free, Verification, refinement mapping, PVS

Y. Fu, H. Gao and W. H. Hesselink, "Verification of a Lock-Free Implementation of Multiword LL/SC Object," 2009 International Conference on Dependable, Autonomic and Secure Computing (DASC 2009)(DASC), Chengdu, 2009, pp. 31-36.
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