Timers and Sleeping

23.1 Interval Timers

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23.2 Scheduling and Accuracy of Timers

For example, if a real-time timer is set to expire every 2 seconds, then the delivery of individual timer events may be subject to the delays just described, but the scheduling of subsequent expirations will nevertheless be at exactly the next 2-second interval. In other words, interval timers are not subject to creeping errors.

If this support is enabled (via the CONFIG_HIGH_RES_TIMERS kernel configuration option), then the accuracy of the various timer and sleep interfaces that we describe in this chapter is no longer constrained by the size of the kernel jiffy.

23.3 Setting Timeouts on Blocking Operations

Use alarm() to interupt blocked syscall

23.4 Suspending Execution for a Fixed Interval (Sleeping)

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23.5 POSIX Clocks

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23.6 POSIX Interval Timers

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23.7 Timers That Notify via File Descriptors: the timerfd API

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23.8 Summary

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