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critical section is a piece of code that accesses a shared resource (data structure or device) that must not be concurrently accessed by more than one thread of execution. A critical section will usually terminate in fixed time, and a thread, task or process will have to wait a fixed time to enter it (aka bounded waiting). Some synchronization mechanism is required at the entry and exit of the critical section to ensure exclusive use, for example a semaphore.

critical section can be called as segment code which can be used in updating of tables ,writing of files and so on. it contains 3 section
i)entry section
ii)exit section
iii)remainder section

do{
entry section
critical section
exit section
remainder section
}while(1)

Critical section is the area of the code/instruction that should be executed atomically. Like writing to a shared port, shared file or a shared memory. Some languages provide a buildin features to overcome from it like semaphore and mutex class in java.


The easy way is to locking the shared resources by threads/processes:

eg:

acquireLock()
critical Section
releaselock()