Answer:
a semaphor is nothing but a term used in unix for a
variable which acts as a counter.for instance there may be
times when two processes try to access the same file
simultaneously.in this event we must control the access of
the when the other process is accessing
this is done by assigning value to a semaphore.
the value of the semaphore is initialized by the 1st
process when the file is in access by it.when the 2nd
process try to access the file it checks the value of the
semaphore and if it finds the value as initialized it does
not access the file.
variable which acts as a counter.for instance there may be
times when two processes try to access the same file
simultaneously.in this event we must control the access of
the when the other process is accessing
this is done by assigning value to a semaphore.
the value of the semaphore is initialized by the 1st
process when the file is in access by it.when the 2nd
process try to access the file it checks the value of the
semaphore and if it finds the value as initialized it does
not access the file.
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