sol-Tutorial4

sol-Tutorial4 - Question 1 This implementation supports...

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Question 1 This implementation supports: - Mutual exclusion: as protected by the binary semaphore, once a philosopher successfully gets pass the wait(sem) operation, this guarantees that he is exclusively in the critical section (and enjoys having his meal). - Deadlock: as only one philosopher can enter the critical section, no hold and wait situation could be happened; hence, this implementation is free of deadlock. - Starvation: because of the use of busy waiting in the semaphore, this would have a chance of having starvation for unlucky philosopher(s). - Performance: poor performance as only one philosopher can enter the critical section; in other words, no concurrency at all. Question 2
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Semaphore patient = 0; //counting semaphore to count Semaphore dentist = 0; //binary semaphore - indicate whether the dentist is available or not Semaphore lock = 1; //act as a mutex lock Semaphore emptychair = 0; //wait for the dental chair to become not occupied int patient_count = 0; //indicate how many patients in the clinic waiting to be served
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  • Spring '10
  • DR
  • dentist, Semaphore dentist

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