Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
3rd Edition
ISBN: 9780134123837
Author: Randal E. Bryant, David R. O'Hallaron
Publisher: PEARSON
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Chapter 12, Problem 12.34HW
Program Plan Intro

I/O Multiplexing:

  • The idea of I/O multiplexing is to use “select” function to ask kernel to suspend process.
  • It returns control to application only after one or more I/O events had occurred.
  • It denotes waiting for a set of descriptors that is ready for reading.
  • The “select” function would manipulate sets of type “fd_set”, that denotes descriptor sets.
  • It takes two inputs: a descriptor set called “read set” and cardinality of read set.
  • It blocks until at least one descriptor in read set is ready for reading.
  • A descriptor “k” is ready for reading if and only if a request to read 1 byte from that descriptor would not block.
  • The “fd_set” is been modified that points to argument “fdset” to indicate subset of read set called “ready set”.
  • The value returned by function indicates cardinality of ready set.

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Programming Problems 9.28 Assume that a system has a 32-bit virtual address with a 4-KB page size. Write a C program that is passed a virtual address (in decimal) on the command line and have it output the page number and offset for the given address. As an example, your program would run as follows: ./addresses 19986 Your program would output: The address 19986 contains: page number = 4 offset = 3602 Writing this program will require using the appropriate data type to store 32 bits. We encourage you to use unsigned data types as well. Programming Projects Contiguous Memory Allocation In Section 9.2, we presented different algorithms for contiguous memory allo- cation. This project will involve managing a contiguous region of memory of size MAX where addresses may range from 0 ... MAX - 1. Your program must respond to four different requests: 1. Request for a contiguous block of memory 2. Release of a contiguous block of memory 3. Compact unused holes of memory into one single block 4.…
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