Operating system problems, computer science, Basic Computer Science

Assignment Help:
1. In discussing software algorithms for mutual exclusion, we noted that optimizing compilers and out-of-order execution by processors could invalidate most of these algorithms because such “optimization” does not take into account that the value of a shared variable can be changed by something other than the immediately evident code. This overly-simplistic characterization also happens with I/O devices, especially simple programmed I/O where data or control register contents changes as a result of the state of the device, not as a consequence of execution of processor instructions, as well as with clocks where the current time register changes continually. It also happens when DMA is used to input blocks of data, which is slightly more complex because the addresses whose value changes are not evident literally. What does this imply about device drivers?

Related Discussions:- Operating system problems, computer science

Simple batch systems, Simple Batch Systems: Early machines were very...

Simple Batch Systems: Early machines were very expensive, and therefore it was important to maximize machine utilization. To improve utilization, the concept of batch operat

Data Type Conversion, Sometimes you may drop to perform conversions among t...

Sometimes you may drop to perform conversions among the built-in types. To translate between types you just use the type name as a function. There are quite a few built-in function

#title., what is input and output device? explain meaning of input and outp...

what is input and output device? explain meaning of input and output devices

Unix, How do I change file permissions? Every time I execute chmod commands...

How do I change file permissions? Every time I execute chmod commands it tells me permission denied.

What are the three basic security provided by ssl, QUESTION (a) Can SSL...

QUESTION (a) Can SSL be used to encrypt email data? Justify your answer (b) What are the three basic security provided by SSL? (c) State the port number used by applicati

Ricochet wireless data network, The Internet is replete with great success ...

The Internet is replete with great success stories and sad failures. While it is always nice to hear about the successes, more can probably be learned from the failures. In this ca

What is Kernel-Level Thread in operating system?, In this technique, the ...

In this technique, the kernel knows about and handles the threads. No runtime system is required in this case. In place of thread table in each process, the kernel has a thread tab

Machines which exhibit intelligent nature, Machines which exhibit intellige...

Machines which exhibit intelligent nature Machines in this case could easily be personal computers, or they could be robots with embedded systems, or a combination of both. Wh

File management, File Management:   The concept of a file is central t...

File Management:   The concept of a file is central to the effective use of a computer system. A file is generally loosely defined as a collection of related information such

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd