Question

give the value of the updated semaphore and the content of the updated semaphore queue.

Counting Semaphores: S1, S2, S3 Binary Semaphores: S4, S5, S6 Semaphores initial values:

S1 = 1,   S2 = 0,   S3 = 2,   S4 = 0,   S5 = 1,   S6 = 1

1) P1: P(S3)

2) P2: P(S5)

3) P3: P(S5)

4) P5: P(S2)

5) P2: V(S2)

6) P10: V(S6)

7) P2: P(S4)

8) P6: P(S5)

9) P4: V(S4)

10)P4: P(S2)

Answer 1

For binary semaphore;

P(semphore) will decrease the value of semaphore if it's value is greater than zero or it will block the process.

V(semphore) will unblock a process if any or will increase increase the value of semaphore by 1.

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