what is Semaphore and explain with example?, Basic Computer Science

Assignment Help:
Description
A semaphore is a confined variable whose value can be accessed and changed only by the operations P and V and initialization operation known as ''Semaphoiinitislize''.
• Binary Semaphores can take for granted only the value 0 or the value 1 counting semaphores also described general semaphores can suppose only nonnegative values.

• The P (or wait or sleep or down) operation on semaphores S, assumed as P(S) or wait (S), controls as follows:
• P(S):

IF S > 0
THEN S := S - 1
ELSE (wait on S)

The V (or signal or wakeup or up) process on semaphore S, written as V(S) or signal (S), controls as follows:
V(S): IF (one or additional process are waiting on S)
THEN (let one of these processes proceed)
ELSE S := S +1


Related Discussions:- what is Semaphore and explain with example?

Calculate simple interest -algorithm, Algorithm : 1. Read the values of pri...

Algorithm : 1. Read the values of principal amount, time and rate of simple interest into the locations labelled as P, T, R. 2. Set the count T to 1 implying the end of a year. 3.

Two dimensional arrays, Two dimensional Arrays:  A two-dimensional array ...

Two dimensional Arrays:  A two-dimensional array is like a table, with a defined number of rows, where each row has a defined number of columns. In some instances we need to  hav

OPERATING SYSTEM, WHAT IS MULTIPLE CONTIGUOUS VARIABLE PARTITIONING

WHAT IS MULTIPLE CONTIGUOUS VARIABLE PARTITIONING

Visual basics, Assume that s is a string variable  that is supposed to con...

Assume that s is a string variable  that is supposed to contain a value to be converted to integer. Write a fragment of code that converts the value to integer variable  and displ

Enterprise resource planning, ENTERPRISE RESOURCE PLANNING What ...

ENTERPRISE RESOURCE PLANNING What has football got to do with it? asks management guru Michael Hammer in his latest best seller Beyond Reengineering. The answer is almos

Computer generations, Computer Generations: From the early 1940's to t...

Computer Generations: From the early 1940's to the present, computer scientists have been able to identify clear-cut stages in the development of computer technology. With eac

Vdu visual display unit output, VDU (Visual Display Unit) output...

VDU (Visual Display Unit) output Make sure that VDUs are of an appropriate type. They can cause severe eyestrain and tension if you do not check: (a) Colour (

What is the definition of macro?, Definition of the macro A macro is a col...

Definition of the macro A macro is a collection of repetitive instructions in a program which are codified only one time and can be used as many times as required. The major differ

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