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.

Question

Want to see the full answer?

Answer 1

Question

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.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

Lab 07: Java Graphics (Bonus lab) In this lab, we'll be practicing what we learned about GUIs, and Mouse events. You will need to implement the following: ➤ A GUI with a drawing panel. We can click in this panel, and you will capture those clicks as a Point (see java.awt.Point) in a PointCollection class (you need to build this). о The points need to be represented by circles. Below the drawing panel, you will need 5 buttons: о An input button to register your mouse to the drawing panel. ○ о о A show button to paint the points in your collection on the drawing panel. A button to shift all the points to the left by 50 pixels. The x position of the points is not allowed to go below zero. Another button to shift all the points to the right 50 pixels. The x position of the points cannot go further than the You can implement this GUI in any way you choose. I suggest using the BorderLayout for a panel containing the buttons, and a GridLayout to hold the drawing panel and button panels.…

If a UDP datagram is sent from host A, port P to host B, port Q, but at host B there is no process listening to port Q, then B is to send back an ICMP Port Unreachable message to A. Like all ICMP messages, this is addressed to A as a whole, not to port P on A. (a) Give an example of when an application might want to receive such ICMP messages. (b) Find out what an application has to do, on the operating system of your choice, to receive such messages. (c) Why might it not be a good idea to send such messages directly back to the originating port P on A?

Discuss how business intelligence and data visualization work together to help decision-makers and data users. Provide 2 specific use cases.