Assume there are three processes (P1, P2, P3) in the system, competing for four resources: (MONITOR,...

 

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Assume there are three processes (P1, P2, P3) in the system, competing for four resources: (MONITOR, NETWORK, PRINTER, USB). Each resource is protected by a semaphore that ensures mutually exclusive access to the resource (ie: a process must call USB.Wait() before using USB). The programs are as follows: P1 Code P2 Code /* Some stuff happened above*/ /* Some stuff happened above*/ MONITOR.Wait(); NETWORK.Wait(); PRINTER.Wait(); /* Execute critical section*/ // P1 has what it needs PRINTER.Signal(); NETWORK.Signal(); MONITOR.Signal(); USB.Wait(); MONITOR.Wait(); PRINTER.Wait(); //P2 has what it needs /* Execute critical section */ PRINTER.Signal(); MONITOR.Signal(); USB.Signal(); P3 Code /* Some stuff happened above*/ NETWORK.Wait(); PRINTER.Wait(); MONITOR.Wait(); //P3 has what it needs /* Execute critical section */ MONITOR.Signal(); USB.Signal(); NETWORK.Signal(); a) Show, using a resource allocation graph (or by other convincing arguments) that this system contains within it the possibility of deadlock. Activate Win b) Suggest a way to re-order the code that ensures there will not be deadlock, but preserves the Go to Settings to necessary mutual exclusion. Assume there are three processes (P1, P2, P3) in the system, competing for four resources: (MONITOR, NETWORK, PRINTER, USB). Each resource is protected by a semaphore that ensures mutually exclusive access to the resource (ie: a process must call USB.Wait() before using USB). The programs are as follows: P1 Code P2 Code /* Some stuff happened above*/ /* Some stuff happened above*/ MONITOR.Wait(); NETWORK.Wait(); PRINTER.Wait(); /* Execute critical section*/ // P1 has what it needs PRINTER.Signal(); NETWORK.Signal(); MONITOR.Signal(); USB.Wait(); MONITOR.Wait(); PRINTER.Wait(); //P2 has what it needs /* Execute critical section */ PRINTER.Signal(); MONITOR.Signal(); USB.Signal(); P3 Code /* Some stuff happened above*/ NETWORK.Wait(); PRINTER.Wait(); MONITOR.Wait(); //P3 has what it needs /* Execute critical section */ MONITOR.Signal(); USB.Signal(); NETWORK.Signal(); a) Show, using a resource allocation graph (or by other convincing arguments) that this system contains within it the possibility of deadlock. Activate Win b) Suggest a way to re-order the code that ensures there will not be deadlock, but preserves the Go to Settings to necessary mutual exclusion.