What are semaphores, Computer Engineering

Assignment Help:

What are semaphores?

Semaphore: A semaphore is a synchronization tool which gives a general-purpose solution to controlling access to critical sections. It s an abstract data type (ADT) which defines a nonnegative integer variable that, apart from initialization, is accessed simply through two standard operations that are: wait and signal. The typical definition of wait in pseudo code is

wait(S){

          while(S<=0)

                 // do nothing

                          S--; }

The classical definitions of signal in pseudo code is signal(S){

                    S++; }

While one process modifies the semaphore value, anno one process can concurrently modify that similar semaphore value. As well, in the case of the wait(S), the testing of the integer value of S (i.e. S<=0), and its possible modification(S--), should also be executed without interruption.


Related Discussions:- What are semaphores

What are the graphics adapters, Graphics adapters: Video card converts...

Graphics adapters: Video card converts digital output from computer into an analog video signal and transmits the signal through a cable to monitor also known as a graphics ca

Explain the ccitt hierarchical structure of routing, Explain the CCITT hier...

Explain the CCITT hierarchical structure of routing using block schematic. In right-through routing the originating exchange finds the whole route from source to destination. N

Explain active matrix or thin film transistor technology, Q. Explain Active...

Q. Explain Active Matrix or Thin Film Transistor technology? This is known as TFT (Thin Film Transistor) technology. In this there is a transistor at every pixel acting as a r

DoDAF OV-2 for a green datacenter, How do I create a DoDAF OV-2 for the con...

How do I create a DoDAF OV-2 for the construction of a green data center?

File structures, Write in brief about UNIX process structure.

Write in brief about UNIX process structure.

Describe about the embedded applications assembly, Describe about the Embed...

Describe about the Embedded applications assembly Embedded applications assembly and C programs are developed since embedded programs aren't large. For all others high-level an

Binary search tree, Given the following interface public interface WordS...

Given the following interface public interface WordSet extends Iterable { public void add(Word word); // Add word if not already added public boolean contains(Word word);

What is one-way association, What is one-way association? One-way assoc...

What is one-way association? One-way association means association will traverse in only in one direction and implement using the actual implementation. If the multiplicity is

For which class address 192.5.48.3 belogs, Address 192.5.48.3 belongs to? ...

Address 192.5.48.3 belongs to? Address 192.5.48.3 belongs to class C.

Draw a diagram to illustrate the design pattern, Problem: (a) What show...

Problem: (a) What shows a Pattern a Pattern? (b) Which pattern is given below? Justify your answer. public class A { private static A instance = null; private A() {

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