Earliest Deadline First Scheduling of Hard Real Time Systems

Q1. Explain Earliest Deadline First Scheduling of Hard Real Time Systems.

Ans. Earliest Deadline First (EDF) scheduling dynamically assigns priorities according to deadline. The earlier the deadline, the higher the priority; the later the deadline the lower the priority. Under the EDF policy, when a process becomes runnable, it must announce its deadline requirements to the system. Priorities may have to be adjusted to reflect the deadline of the newly runnable process.

Note how this differs from rate-monotonic scheduling, where priorities are fixed.

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