What is MUTEX?
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Mutex is a program object that allows multiple program
threads to share the same resource, such as file access,
but not simultaneously. When a program is started a mutex
is created woth a unique name. After this stage, any thread
that needs the resource must lock the mutex from other
threads while it is using the resource. the mutex is set to
unlock when the data is no longer needed or the routine is
finished.
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