Operating System (OS)
Uniform Symbols Table

a permanent table which lists all key words and special symbols of the language in symbolic form
contains all constants in the program
consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
None of these

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Operating System (OS)
Semaphores

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

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