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UF COP4600 - Exam 1 Questions and Answers (Latest 2024)
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UF COP4600 - Exam 1 Questions and Answers (Latest 2024)
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UF COP4600 - Exam 1 Questions andAnswers (Latest 2024)
Algorithm - Correct Answer ✅set of instructions with finite
initial store and state, a starting point, and unambiguous
ordering until the endpoint
Process (general definition) - Correct Answer ✅a program
in execution
= program + state
Program - Correct Answer ✅sequence of instructions that
embody an algorithm
Job - Correct Answer ✅a task to be completed
Why need an O.S.? - Correct Answer ✅- load program onto
computer
- access and supervise I/O devices
- manage resources
- protect private info
- facilitate program interactions
,UF COP4600 - Exam 1 Questions and
Answers (Latest 2024)
2 main OS Roles? - Correct Answer ✅1. resource manager
2. extended machine
3 types of resource management - Correct Answer ✅1.
process manager (who executes)
2. memory manager
3. I/O management
Purpose of extended machine - Correct Answer ✅allows
user to not think about low-level things. (file storage for
example)
What OS is not? - Correct Answer ✅- not UI
- not development tools
- not libraries (even if it may use them)
3 general OS types - Correct Answer ✅- interactive
(laptop/pc)
- batch (priority is pre-defined queued tasks)
- real time (well-defined task priorities like in avionics or cars)
,UF COP4600 - Exam 1 Questions and
Answers (Latest 2024)
5 generations of OS - Correct Answer ✅'45-'55 : vacuum
tubes / plugboards
'55-'65 : transistors/batch
'65-'80 : ICs and timesharing
'80-now : PCs
'90-now : mobile computers and multicore systems
Multiprogramming v. Uniprogramming - Correct Answer
✅multiple = 2+ programs' data concurrently in main
memory (RAM)
(uni is just 1 at a time)
T/F: modern systems do not allow direct reads from the disk,
rather a syscall is passed to the kernel which then returns the
info (if allowed) - Correct Answer ✅True
2 types of named calls - Correct Answer ✅1. procedure
calls
2. system calls
, UF COP4600 - Exam 1 Questions and
Answers (Latest 2024)
Procedure Calls - Correct Answer ✅- essentially a function
call
- no context switch to kernel space (faster bc no OS help
necessary)
- local vars and parameters
- frame pointer (where stack was before call)
- stack pointer (where new bottom of stack is)
Segments of Process in Memory - Correct Answer ✅-
TEXT(lowest): code being executed
- DATA(middle growing up): static + dynamic
- STACK(highest growing down): activation frames of calls
System Calls - Correct Answer ✅- provide interface to OS
services
- context switch to kernel mode
- has sys lib entry point
- invocation causes kernel trap
- sys call number identifies a sysfunc from table
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