Library prosa.analysis.definitions.blocking_bound.fp

Require Export prosa.model.task.preemption.parameters.

Blocking Bound for FP

In this section, we define a bound on the length of a non-preemptive segment of a lower-priority job (w.r.t. a task tsk) under FP scheduling.

Section MaxNPSegmentBlockingBound.

Consider any type of tasks.

Context {Task : TaskType}.
Context `{TaskMaxNonpreemptiveSegment Task}.

Consider an FP policy.

Context {FP : FP_policy Task}.

Consider an arbitrary task set ts.

Variable ts : list Task.

Assuming that tasks are independent, the maximum non-preemptive segment length w.r.t. any lower-priority task bounds the maximum possible duration of priority inversion.

  Definition blocking_bound (tsk : Task) :=
    \max_(tsk_other <- ts | ~~ hep_task tsk_other tsk )
     (task_max_nonpreemptive_segment tsk_other - ε ).

End MaxNPSegmentBlockingBound.