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Write a program that demonstrates the use of nice() system call. After a child process is started using fork(), assign higher priority to the child using nice() system call.

 

#include<stdio.h>
#include<unistd.h>
int main()
{
    int pid,retnice;
    printf("Press DEL to stop process\n");
    pid=fork();
    for(;;)
    {
        if (pid==0)
        {
            retnice=nice(-5);
            printf("Child gets higher CPU priority %d \n",retnice);
            sleep(1);
        }
        else
        {
            retnice=nice(4);
            printf("Parent gets lower CPU priority %d \n",retnice);
            sleep(1);
        }
    }
}

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