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RTCSA
1998
IEEE

Wait-Free Snapshots in Real-Time Systems: Algorithms and Performance

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Wait-Free Snapshots in Real-Time Systems: Algorithms and Performance
Snap-shot mechanisms are used to read a globally consistent set of variable values. Such a mechanism can be used to solve a variety of communication and synchronization problems, including system monitoring and control of real-time applications. Methods based on locking (e.g. using semaphores) are penalized by blocking, which typically leads to difficulties in guaranteeing deadlines of high priority tasks. Lock-free methods, which take a snap-shot and then check if it corresponds to a consistent system state, have unpredictable timing-behavior, since they may have to retry an unpredictable number of times. Clearly, a method which combines the predictability of locking-based methods with the low interference (no blocking) of lock-free methods is desirable. In this paper we present one such method, based and the concept of wait-freeness. A wait-free method is a lockfree method which is guaranteed to correctly complete in a bounded number of steps. The price to pay for this predictabilit...
Andreas Ermedahl, Hans Hansson, Marina Papatrianta
Added 05 Aug 2010
Updated 05 Aug 2010
Type Conference
Year 1998
Where RTCSA
Authors Andreas Ermedahl, Hans Hansson, Marina Papatriantafilou, Philippas Tsigas
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