Details on priority flip (ebook excerpt)

 

Let us take a closer look at the process depicted in Figure 3-8. thread a acquires a resource, and afer a while it is pushed away by higher-priority thread B, which in its turn is pushed away thread C, which, after a while, is blocked while waiting
Aresource captured by thread. because thread A is not the highest-priority thread of ones that are left, after the Haigh-priority thread C is blocked, it will stop executing and the resource will remain is concerned. when a similar situation is detected,
The scheduler increases the prority thread has freed a resource. After that, the priority level of low-priority thread a is restored, and thread C continues executing.