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COP 4600 Midterm Review Questions And 100% Correct Answers
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COP 4600 Midterm Review Questions And 100%Correct Answers
______ is a part of a process that has ______ - ANSWER Thread;
Its own execution history( can't have without a stack)
Program Counter
Stack
Every process has ______ threads and every thread ____ - ANSWER one or more threads;
belongs to exactly one process
Elements that are unique to a process but not a thread - ANSWER text(instructions)
data (constants/statics)
heap( dynamic allocations)
SC reason for using many threads instead of processes - ANSWER Save overhead and
sharing might be easier
**Threading: Classical Model; Describe Uniprogrammed, Multiprocess Model and
Threaded Model - ANSWER Uni: One process at a time - wait for process to finish;
Multiprocess: Switch between processes.
Threaded switch between threads within process. (this reduces context switch times)
Why use threads - ANSWER - split complicated jobs into simpler ones
, -increase productivity
compared to new processes, threads have - ANSWER -less memory overhead(sharing of
segments)
-sharing of information-through shared data
-less overhead in creating,
destroying time - allocation copying
-reduce context switching time - to another thread in the same process only
what is in a thread? (give Process Specific versus Thread Specific Components) -
ANSWER Specific to A Thread:
Program Counter
Registers
Stack
State
Particular to A Process:
Address Space
Global Variables
Open file
Child processes
Pending alarms
signals and handlers
CPU accounting
Describe the key differences between kernel and user space threads - ANSWER User
threads:
-User Library
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