Work-Bearing Readiness

In this module, we introduce a property of readiness models that is called work-bearing readiness. Work-bearing readiness extracts the useful property of the classic readiness model stating that, if there is a job pending at a time instant [t], then there also exists a job that is ready at time [t]. In other words, we say that a readiness model is a work-bearing readiness model if, for any job [j] and any time instant [t], if job [j] is pending but not ready at [t], then there is a job with higher or equal priority [j_hp] that is both pending and ready at time [t].

Consider any type of job associated with any type of tasks ...

... and any kind of processor state.

Further, allow for any notion of job readiness.

Consider any job arrival sequence, ...

... any schedule of these jobs, ...

... and a JLFP policy that indicates a higher-or-equal priority relation.

If a job [j] is pending at a time instant [t], then (even if it is not ready at time [t]) there is a job [j_hp] with higher-or-equal priority that is ready at time instant [t].