# Figure 11.13 illustrates the behaviour of four periodic tasks w, x, y and 2. These tasks have…

Figure 11.13 illustrates the behaviour of four periodic tasks w, x, y and 2. These tasks have priorities determined by the rate monotonic scheme, with the result that priority(w) > priority(x) > priority(y) > priority(z). Each task’s period starts at time S and terminates at T. The four tasks share two resources that are protected by binary semaphores A and B. On the diagram the tag A (and B) implies ‘do a wait operation on the semaphore’; the tag A’ (and B’) implies ‘do a signal operation on the semaphore’. Table 11.23 summarizes the task’s requirements. The figure shows the execution histories of the four tasks using static priorities. For example, x starts at time 2, executes a successful wait operation on B at time 3 but unsuccessfully waits on A at time 4 (z has already locked A). At time 13 it executes again (that is, it now has lock on A), it releases A at time 14 and B at time 15. It is now pre-empted by w, but executes again at time 16. Finally, it terminates at time 17. Redraw Figure 11.13 to illustrate the behaviour of these tasks if priority inheritance is employed

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