Here's a question that came up while teaching priority inheritance w.r.t. mutex locking in class today...

Let's say thread A is RUNNING and B is READY both at priority 21 on a single core system. We also have C at priority 10 with a mutex locked. Thread A calls pthread_mutex_lock() to lock that mutex. A of course MUTEX blocks and C's priority is bumped up to 21. The question is who runs when C unlocks the mutex, A or B? B is next in the list but will A be moved to the head of the list and run instead?

Thanks,
Steve



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OSTech
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