Title
Time Management in Partitioned Systems: Usage of Tickbased, Oneshot and Firm timers in Partitioned Systems,Used
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Time management is one of the critical modules of safetycritical systems. Applications need strong assurance from the operating system that their hard realtime requirements are met. Applications running on a realtime system request the service of time management in one way or the other. These requests must be handled in a deterministic and accurate way with lower overheads. The three wellknown approaches for handling timer requests are tickbased, oneshot and firm timer. Traditionally tickbased has been the most popular approach that relies on periodic interrupt timer, although it has a poor accuracy. Oneshot timer approach provides better accuracy as the timer interrupt can be generated exactly when required. Firm timers use soft timers in combination with oneshot timer wherein the expired timers are checked at strategic points in the kernel. The work compares the performance of these three approaches for partitioned systems and provides an insight about the suitability of the approaches. It also compares various algorithms of tickbased and oneshot timer which benefits realtime applications.
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