1. #include <stdio.h>
    2. #include <stdlib.h>
    3. #include <sys/time.h> 
    4. #include <time.h> 
    5. #include <sched.h> 
    6. #include <sys/types.h>
    7. #include <unistd.h>
    8. //pipe()
    9. int main() 
    10. {
    11.     int x, i, fd[2], p[2];
    12.     char send = 's';
    13.     char receive;
    14.     pipe(fd);
    15.     pipe(p);
    16.     struct timeval tv;
    17.     struct sched_param param;
    18.     param.sched_priority = 0;
    19.     while ((x = fork()) == -1);
    20.     if (x==0) 
    21.     {
    22.         sched_setscheduler(getpid(), SCHED_FIFO, &param);
    23.         gettimeofday(&tv, NULL);
    24.         printf("Before Context Switch Time%u s, %u usn", tv.tv_sec, tv.tv_usec);
    25.         for (i = 0; i < 10000; i++) 
    26.         {
    27.             read(fd[0], &receive, 1);
    28.             write(p[1], &send, 1);
    29.         }
    30.         exit(0);
    31.     } else 
    32.     {
    33.         sched_setscheduler(getpid(), SCHED_FIFO, &param);
    34.         for (i = 0; i < 10000; i++) 
    35.         {
    36.             write(fd[1], &send, 1);
    37.             read(p[0], &receive, 1);
    38.         }
    39.         gettimeofday(&tv, NULL);
    40.         printf("After Context SWitch Time%u s, %u usn", tv.tv_sec, tv.tv_usec);
    41.     }
    42.     return 0;
    43. }