Answer Posted / ragavendran
Semaphores are devices used to help with synchronization. If
multiple processes share a common resource, they need a way
to be able to use that resource without disrupting each
other. You want each process to be able to read from and
write to that resource uninterrupted.
A semaphore will either allow or disallow access to the
resource, depending on how it is set up. One example setup
would be a semaphore which allowed any number of processes
to read from the resource, but only one could ever be in the
process of writing to that resource at a time.
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