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 12.22HW
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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