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

Define register file, Define register file. All general purpose registe...

Define register file. All general purpose registers are combined into a one block called the register file.

What can be middle wares role within e-commerce, What can be middle wares r...

What can be middle wares role within e-commerce? By the utilize info Platform Commerce Server a shopping service can take benefit of reaching the end user onto Open TV, SMS, WA

Develop a system to store change logs, The ?rst task in the project is to d...

The ?rst task in the project is to develop a sane system to store change logs and versions of ?les. The simplest approach is to create a "dot" directory in the location of the ?le

Define the actions a process take upon receiving a signal, Define the vario...

Define the various actions a process might be take upon receiving a signal? There are various actions a process might be take upon receiving a signal here are three different d

Episodes - artificial intelligence , Episodes - artificial intelligence: ...

Episodes - artificial intelligence: If an agent's current choice of action not based on its past reactions, then the environment is known as episodic. In the non-episodic envi

Testmanager can be used for performance testing, Rational Testmanager is a ...

Rational Testmanager is a complicated tool that can be used for automating performance tests on client/server systems. A client/server system have client applications accessing a d

Dram simm, The most common type of non-volatile memory is the ROM device. T...

The most common type of non-volatile memory is the ROM device. This device is read only and the data is masked into the chip during manufacture. Variations of the ROM are one off p

Reduce minimum literals and derive their complements, Q. Reduce following t...

Q. Reduce following to minimum literals and derive their complements. 1. [(AB)'A][(AB)'B] 2. ABC(ABC' + AB'C + A'BC) 3. (A+C+D) (A+C+D') (A+C'+D)(A+D')

Ethernet 10 base 2 is an example of which topology, Ethernet 10 Base 2 is a...

Ethernet 10 Base 2 is an example of               network topology. (A)  Bus                                           (B)  Ring (C)  Star

State the web server security through ssl, Web server security through SSL ...

Web server security through SSL (Secure Socket Layer) As it is well known that the Intranets and internet are purely based on use of powerful web servers to deliver information

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