June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Real-time policies
Real-time policies are intended for determinism. The real-time scheduler will always run the highest priority real-time thread that is ready to run. Real-time threads always preempt timeshare threads. In essence, by selecting a real-time policy over a timeshare policy, you are saying that you have inside knowledge of the expected scheduling of this thread and wish to override the scheduler's built-in assumptions.
There are two real-time policies:
- SCHED_FIFO: This is a run to completion algorithm, which means that once the thread starts to run, it will continue until it is preempted by a higher priority real-time thread, it is blocked in a system call, or until it terminates (completes).
- SCHED_RR: This a round robin algorithm ...
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