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25-26 CS2850: Operating Systems

25-26 CS2850: Operating Systems

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Select the incorrect statement about files:

A file is not removed from disk when the process that created it terminates

❌

Only one process at a time can access a file

✅

They abstract away from file system implementation details

❌

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Select the incorrect statement about segmentation:

Segments can be shared among processes

The content of a segment may change during execution

All segments of a process share the same page table

Segmentation allows different memory areas to have different protection levels

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Consider the FIFO, the second-chance and the clock replacement algorithms. What happens in each of these cases if the oldest page has R = 1?

FIFO

Clock

Second-chance

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This question is about the working set algorithm. Suppose the current virtual time is 360ms, and τ = 50ms. The page currently being examined has:

Time of last use = 300ms

R = 1

What happens to this page?

It is evicted, as its age is bigger than τ

❌

It is kept, and its time of last use is set to 360ms

✅

It is kept, but is considered a candidate for eviction if no other suitable page is found

❌

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Consider the page table in the following picture, translating 16 bit addresses to 15 bit ones:

Which physical address is the virtual address 36899 translated to?

None, as a page fault is generated

20515

24611

36899

Select all the correct statements about virtual memory:

Virtual memory can be larger than physical memory

✅

All pages of a program are always in main memory

❌

a page is a contiguous range of addresses

✅

Address referenced by a program are used to directly access physical memory

❌

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Connect library names with their description.

<math.h>

<string.h>

<errno.h>

<stdio.h>

<unistd.h>

<stdlib.h>

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Why has C been called a system programming language?

C is not tied to any operating system

❌

C deals with simple objects: characters, addresses, numbers

❌

C is useful for writing operating systems or compilers

✅

C provides a better, simpler, and cleaner model of the computer

❌

C is a general-purpose programming language

❌

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Which of the following statements about C is true?

C has built-in read- and write-statements

C has a dynamical memory allocation facility

50%

C allows operation between composite objects such as strings of characters

C has single-thread control flow operations

❌

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Select the incorrect statement about the base-limit approach to relocation:

The limit register is loaded with the length of the program

Memory references are added the base value when the program is loaded into memory

when an instruction referencing address X is executed, if X + base > base + limit a fault is generated

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