Critical Regions

Q1. Explain Critical Regions.

Ans. In many situations involving shared memory, shared files, and shared everything else is to find some way to prohibit more than one process from reading and writing the shared data at the same time. Put in other words, what we need is mutual exclusion, that is, some way of making sure that if one process is using a shared variable or file, the other processes will be excluded from doing the same thing.

Sometimes a process has to access shared memory or files, or do other critical things that can lead to races. That part of the program where the shared memory is accessed is called the critical region or critical section. If we could arrange matters such that no two processes were ever in their critical region at the same time, we could avoid races.

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