Operating System (OS)
Semaphores

synchronize critical resources to prevent deadlock
are used to do I/O
are used for memory management
synchronize critical resources to prevent contention
None of these

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to build a literal table and an identifier table
to parse the source program into the basic elements or tokens of the language.
to build a uniform symbol table
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
None of these

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