Write a program to create 4 processes: parent process and its child process which perform various tasks :
- Parent process count the frequency of a number
- 1st child sort the array
- 2nd child find total even number(s) in a given array
- 3rd child calculate the sum of even numbers in an array
Example –
Input : 2, 4, 6, 7, 9, 0, 1, 5, 8, 3 Output : Parent process : the key to be searched is 7 the frequency of 7 is 1 1st child process : the sorted array is 0 1 2 3 4 5 6 7 8 9 2nd child process : Total even no are: 5 3rd child process : the sum is :45
Explanation – Here, we had used fork() function to create 4 processes three child and one parent process. So, here we use two fork() function which create 4 process n1=fork() and n2 = fork()
- if n1 and n2 is greater than zero then it is parent process which counts the frequency of a number.
- if n1 is equal to zero and n2 is greater than zero then it is 1st child process which sorts the given array.
- if n1 is greater than zero and n2 is equal to zero than it is 2nd child process which finds the total even numbers in the array.
- if n1 and n2 both equal to zero then it is 3rd child calculates the sum of all elements in an array.
Code –
// C++ code to demonstrate the calculation // in parent and its 3 child processes using fork() #include <iostream> #include <unistd.h> using namespace std; int main() { int a[10] = { 2, 4, 6, 7, 9, 0, 1, 5, 8, 3 }; int n1, n2, i, j, key, c, temp; n1 = fork(); n2 = fork(); // if n1 is greater than zero // and n2 is greater than zero // then parent process executes if (n1 > 0 && n2 > 0) { int c = 0; cout << "Parent process :" << endl; // key to be searched is 7 key = 7; cout << "the key to be searched is " << key << endl; for (i = 0; i < 10; i++) { if (a[i] == key) // frequency of key c++; } cout << "the frequency of " << key << " is " << c << endl; } // else if n1 is zero // and n2 is greater than zero // then 1st child process executes else if (n1 == 0 && n2 > 0) { cout << "1st child process :" << endl; for (i = 0; i < 10; i++) { for (j = 0; j < 9; j++) { if (a[j] > a[j + 1]) { temp = a[j]; a[j] = a[j + 1]; a[j + 1] = temp; } } } cout << "the sorted array is" << endl; for (i = 0; i < 10; i++) { cout << a[i] << " "; } cout << endl; } // else if n1 is greater than zero // and n2 is zero // then 2nd child process executes else if (n1 > 0 && n2 == 0) { int f = 0; cout << "2nd child process :" << endl; for (i = 0; i < 10; i++) { // counting total even numbers if (a[i] % 2 == 0) { f++; } } cout << " Total even no are: " << f << " "; cout << endl; } // else if n1 is zero // and n2 is zero // then 3rd child process executes else if (n1 == 0 && n2 == 0) { cout << "3rd child process :" << endl; int sum = 0; // summing all given keys for (i = 0; i < 10; i++) { sum = sum + a[i]; } cout << "the sum is :" << sum << endl; } return 0; } |
Output –
Parent process : the key to be searched is 7 the frequency of 7 is 1 1st child process : the sorted array is 0 1 2 3 4 5 6 7 8 9 2nd child process : Total even no are: 5 3rd child process : the sum is :45
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