Скачать или смотреть Critical section Gate Questions and solutions In operating System In Hindi

Q-4)- GATE- 2007- Previous Year Question On Critical Section In OS In Hindi By Deepak Garg

Critical section Gate Questions and solutions In operating System In Hindi

Critical Section is the part of a program which tries to access shared resources. ... The critical section cannot be executed by more than one process at the same time; operating system faces the difficulties in allowing and disallowing the processes from entering the critical section.
Semaphores which allow an arbitrary resource count are called counting semaphores, while semaphores which are restricted to the values 0 and 1 (or locked/unlocked, unavailable/available) are called binary semaphores and are used to implement locks.

The semaphore discussed previously is called a counting sempahore. Another kind of semaphore is the binary semaphore; This is exactly like a counting semaphore except for the following:
the semaphore value is restricted to 0 and 1.
P succeeds only when the semaphore value is 1.
V does not change the semaphore value when it is 1. (Thus successive Vs are lost.)

Binary semaphores are sometimes easier to implement. than counting semaphores. We will not describe implementations of binary semaphores in terms of low-level or OS constructs (these would be similar to the implementations of counting semaphores). Instead we show how counting semaphores can be implemented by binary semaphores, which demonstrates that binary sempahores are as powerful as counting semaphores.
Convention: Unless otherwise mentioned, a semaphore is to be interpreted as a counting semaphore.

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