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Mastering Embedded Linux Development
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The second big topic I want to cover in this chapter is scheduling. The Linux scheduler has a queue of threads that are ready to run, and its job is to schedule them on CPUs as they become available. Each thread has a scheduling policy that may be time-shared or real-time. The time-shared threads have a niceness value that increases or reduces their entitlement to CPU time. The real-time threads have priority in that a higher-priority thread will preempt a lower one. The scheduler works with threads, not processes. Each thread is scheduled regardless of which process it is running in.
The scheduler runs when any of the following occurs:
sleep()
or another blocking system call.For background information on the Linux scheduler, I recommend that you read the chapter on process...