Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Textbook Question
Chapter 9.8, Problem 9.5PP
Practice Problem 9.5 (solution page 882)
Write a C
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ENGINEERING COMPUTER-SCIENCE
Write a C program to Implement a system of three
processes which read and write numbers to a file.
Each of the three processes P1, P2, and P3 must
obtain an integer from the file (these instructions
must be executed 200 times). The file only holds one
integer at any given time. Given a file F, containing a
single integer N, each process must perform the
following steps
1. Fork two processes
For 200 times:
2. Open F
3. Read the integer N from the file
4. Close F
5. Output N and the process' PID (On the screen)
6. Increment N by 1
7. Open F
8. Write N to F (overwriting the current value in F)
9. Close F
b) Briefly describe why the processes P1, P2, and P3
obtain/read duplicates of numbers (why does a
particular integer x appear in the output of more
than one process)?
Suggest a solution (you do not need to implement it)
√x
8
Problem 2 (Cipher module)• Create a Python file named cipher_module.py with functions to encode and decodestring inputs using the basic Caesar cipher (see here for more informationhttps://en.wikipedia.org/wiki/Caesar_cipher). This cipher is a basic encryptiontechnique that supports encoding and decoding operations on strings.• The encoding operation replaces each character in a string with another charactersome fixed number (shift) of positions down the ASCII table. The string can beencoded using any characters on the ASCII table and no need to use the circular list(where ‘Z’ is followed by ‘A’) image shown below. Your module must have a functionnamed encode() that takes a string and an integer shift (can be positive or negative)as parameters and returns the encoded string using the shift value. This module must
Page 3 of 4also have a second function name decode() that takes an encoded string and aninteger shift as parameters and returns the decoded string. The decoding…
File system implementation:
a. Given a filename in a directory’s data block, how does OS locate the data block of a file?
b. Compare between direct pointers and indirect pointers in referencing data blocks.
c. Given a 6GB file, identify the number of index level needed when using indirect pointer.
Chapter 9 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 9.2 - Prob. 9.1PPCh. 9.3 - Prob. 9.2PPCh. 9.6 - Prob. 9.3PPCh. 9.6 - Prob. 9.4PPCh. 9.8 - Practice Problem 9.5 (solution page 882) Write a C...Ch. 9.9 - Prob. 9.6PPCh. 9.9 - Prob. 9.7PPCh. 9.9 - Prob. 9.8PPCh. 9.9 - Prob. 9.9PPCh. 9.9 - Prob. 9.10PP
Ch. 9 - Prob. 9.11HWCh. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Given an input file hello.txt that consists of the...Ch. 9 - Determine the block sizes and header values that...Ch. 9 - Prob. 9.16HWCh. 9 - Prob. 9.17HWCh. 9 - Prob. 9.18HWCh. 9 - Prob. 9.19HWCh. 9 - Write your own version of malloc and free, and...
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