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

Average waiting time, Customer arrivals at a gas station can be characteriz...

Customer arrivals at a gas station can be characterized by exponential distribution with mean of 10 minutes. The amount of time they take to pump gas can be characterized by an ex

What is page stealing, What is Page stealing? Ans. Taking page frames o...

What is Page stealing? Ans. Taking page frames other working sets is called Page stealing.

Associative array processing, Consider that a list of record or a table is ...

Consider that a list of record or a table is stored in the memory and you wish to find some information in that particular list. E.g. the list comprises three fields as displayed b

3 sets of input data, Prepare at least 3 sets of input data (Test data) alo...

Prepare at least 3 sets of input data (Test data) along with expected output for testing your program.

Describe about digital audio tape, Q. Describe about Digital Audio Tape? ...

Q. Describe about Digital Audio Tape? The most proper tape for backing up data from a disk today is Digital Audio Tape (DAT). It employs a 4mm tape covered in a cartridge. It e

ANS, Smugglers are becoming very smart day by day. Now they have developed ...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Design a 1-bit full adder, Design a 1-bit full adder: Verify your desig...

Design a 1-bit full adder: Verify your design Use the 1-bit full adder to build a 4-bit adder with Ci=0 Verify: 1 + 4, and 9 + 9 Sram design: Cell: p - 0.5/0.045;

Difference between leave transaction and call transaction, What is the diff...

What is the difference between Leave Transaction and Call Transaction? In contrast to LEAVE TO TRANSACTION, the CALL TRANSACTION  statement causes the system to start a new SAP

Define situation as transmitter & receiver, The situation when both transmi...

The situation when both transmitter and receiver have to work in tandem is referred to as? The situation while both transmitter and receiver have to work into tandem is termed

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