Operating System (OS)
Semaphores

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

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Ensuring that system clock works correctly on server
Managing the access to system files in a laptop computers
Controlling the fuel injection system of an automobile engines
Controlling access to a shared printer in a network

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

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.
to build a literal table and an identifier table
to parse the source program into the basic elements or tokens of the language.
None of these
to build a uniform symbol table

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