Write a pseudo code to find sum of two functions, Computer Engineering

Assignment Help:

Q. Write a pseudo code to find sum of two functions?

Let's write a pseudo code to find sum of two functions f(A) + f(B). In first algorithm we will not use locking.

Process A                                Process B

 sum = 0                                           :

    :                                                   :

  fork B                                     sum = sum+ f(B)

   :                                                   :

 sum = sum + f(A)                         end B

    :

    join B   

   :

 end A

If process A executes statement sum = sum + f(A) in addition writes results in main memory followed by computation of sum by process B then we attain correct result however consider case when B executes statement sum = sum + f(B) before process A can write result in the main memory. Then sum comprises only f(B) that is incorrect. To avoid such variation we use locking.  

Process A                                Process B

 sum = 0                                           :

    :                                                   :

    :                                                  lock sum               

  fork B                                     sum = sum + f(B)

   :                                                   unlock sum

  lock sum                                        :

 sum = sum + f(A)                         end B

unlock sum 

   :

    join B   

   :

 end A

In this case every time a process obtains sum variable it locks it sothat no other process can access that particular variable that guarantees consistency in results.


Related Discussions:- Write a pseudo code to find sum of two functions

Name the appliances which are controlled by micro-processor, Name the appli...

Name the appliances which are controlled by micro-processor Many household appliances which are microprocessor-controlled do not have operating systems (for example microwave o

Compute the coefficient for classifier, Consider the data with categorical ...

Consider the data with categorical predictor x 1 = { green or red } and numerical predictor x 2 and the class variable y shown in the following table. The weights for a round

Floating point format, consider the 8 bit floating point format including s...

consider the 8 bit floating point format including support for normalised nimbers and nonnumeric values.it included 3 bits for mantissa and 4 bitys for excess 7 exponent

Scope of supply chain management consultancy, What are included in scope of...

What are included in scope of Supply Chain Management Consultancy? Supply Chain Management Consultancy's scope is extensive, and classically includes as given here: a. Sales

What is a spanning tree, What is a spanning Tree? A spanning tree is a ...

What is a spanning Tree? A spanning tree is a tree associated with a network. All the nodes of the graph appear on the tree once. A minimum spanning tree is a spanning tree

Importance of using module-instance parameter, Using Module-Instance Parame...

Using Module-Instance Parameter: Parameter values can be overridden while a module is instantiated. New parameter values are passed at the time of module instantiation. Top-

Explain how presentation layer helps in establishing, Explain how presentat...

Explain how presentation layer helps in establishing and processing data in End to End layers. The idea of the presentation layer is to stand for information to the communicati

Define the difference between union and structure, Define the difference be...

Define the difference between union and structure The main difference between union and structure is the storage allocation. In Union , for each variable the compiler allocates

Machine centred versus human centred, Machine Centred versus human Centred ...

Machine Centred versus human Centred The discussion here is based on the difference in approach to the design of the work system when we prioritise either the needs of the mac

Explain readers-writers problem, Explain Readers-writers problem. Read...

Explain Readers-writers problem. Readers-writers problem: Assume that a data object (as a file or record) is to be shared between several concurrent processes. The readers ar

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