read writers problem, C/C++ Programming

Assignment Help:
Readers Writers with Processes and Threads
Write two programs implementing ``reader pritority readers-writers synchronization'''' on files. One program will use processes, created with fork(), and synchronized with semaphores. The other program will use threads, created with pthread_create(), and synchronized with mutexes and conditions. In the following, the word "process" is used to describe either a process or thread, as appropriate.
Your program will create two readers and two writers. All four will access a common file, named ``SharedFile.'''' This file should contain a single number. The file should be created and given an initial value of 0 before the processes/threads are spawned.
The reader pseudocode:
repeat 20 times:
acquire read lock
read the number from SharedFile
release the read lock
print a message identifying the process, and the value read from SharedFile
sleep for a random period between 100 and 200 msec
The writer pseudocode:
repeat 20 times:
acquire write lock
read the number from SharedFile
increment it by a random value between 1 and 6
write the new value to SharedFile
release the write lock
print a message identifying the process, and the value written to SharedFile
sleep for a random period between 100 and 400 msec
Submit ONLY your C/C++ source code. Be sure to put your name and course in the comment header. The code must run on the "algebra and friends" machines. Use good programming style (comments, indentation, meaningful identifiers, etc.)

Related Discussions:- read writers problem

Array, Assigning value to individual elements in array

Assigning value to individual elements in array

Convert coordinate - c++ program, Convert coordinate: class rect{  ...

Convert coordinate: class rect{                 private :                 float  x,y;                   public :                 void  input()

Plz reply on [email protected], You are to implement a code cracking ...

You are to implement a code cracking system. The system will deploy four processes (p1,p2,p3 & p4) to try to guess the password of an encrypted code. For encryption, we consider th

C program for string operations, Aim: To implement a program for following...

Aim: To implement a program for following string operations: Length of String. String Concatenation. Substring (provide start index and length) Find character a

Strings, A string S is said to be "Super ASCII", if it contains the charact...

A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the asci

Describe what are dynamic pointers, Question: (a) Describe what are dy...

Question: (a) Describe what are dynamic pointers. Show their memory representations diagrammatically. (b) Write short notes about pointers in arrays, paying attention on

Area under curve, Write a program to find the area under the curve y = f(x)...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

What are the two steps that happen while i say delete p?, A: N delete p is ...

A: N delete p is a two-step procedure: it calls the destructor, and then releases the memory. The code developed for delete p is functionally similar to this (supposing p is of typ

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