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

Types of computer on basis of size and capabilities, Another way of classif...

Another way of classifying a computer system is based upon its size and capabilities: Microcomputers: Microcomputers are systems based on the use of microprocessors. A Micr

Block diagram of computer, Input unit: These are used to read data and tran...

Input unit: These are used to read data and transfer to primary memory contained in CPU through keyboard or floppy disk or mouse etc. Central Processing Unit (CPU): This consists o

Storage mechanism of magnetic disk, Storage Mechanism of Magnetic disk: ...

Storage Mechanism of Magnetic disk: Storage Mechanism: Magnetic disk drives contain metal disks that are coated on both sides with an iron oxide recording material. Several

Properties of Dictionary Keys, Dictionary values encompass no limitations. ...

Dictionary values encompass no limitations. They can be any random Python object, moreover standard objects or user-defined objects. Though, same is not true for the keys. There ar

The central processing unit (cpu), THE CENTRAL PROCESSING UNIT (CPU): T...

THE CENTRAL PROCESSING UNIT (CPU): The CPU is the heart of any computing system.  It executes the individual machine instructions, which make up a program. The CPU is formed fr

Optical fibres, Optical Fibres: Coaxial cables have limitations such a...

Optical Fibres: Coaxial cables have limitations such as broadband transmission medium which can be overcome by the use of optical fibres. Optical fibres carry light waves (rep

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

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