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25-26 CS2850: Operating Systems

25-26 CS2850: Operating Systems

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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

100%

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

100%

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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This question is about free memory handling. For each of the following statements, select the algorithms to which it applies:

It selects the first hole in the list that fits the process

It selects the first hole in the list that fits the process, after the one used for the previous process

It selects the biggest hole in the list that fits the process

It keeps separate lists for processes and holes

It selects the smallest hole in the list that fits the process

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Suppose there are two programs A and B, and the Operating System uses swapping without memory abstraction. Which of the following situations cannot happen?

A and B are both on the disk

A is in memory and B is on the disk

A and B are both in memory in distinct memory areas

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For each of these sentences, select the real-time scheduling algorithm to which it applies:

The system responds to events that occur at regular intervals

The system responds to events that occur unpredictably

Deadlines must be met

Deadlines can occasionally be missed

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In Priority Scheduling for interactive systems, how can the scheduler ensure that low priority processes get a chance to run?

Round-robin is used within each priority class