Download File

}
for (i = 0; i < CHILD_INCREMENT_COUNT; i++)
{
operations[0].sem_num = 0;
operations[0].sem_op = -1;
operations[0].sem_flg = 0;
}
if (semop(semid, operations, 1) < 0)
{
perror("child semop");
exit(1);
}
*child_shm = *child_shm + 1;
if (i%1000 == 0)
{
usleep(1); // sleep 1 us to increase window of critical section
}
operations[0].sem_num = 0;
operations[0].sem_op = 1;
operations[0].sem_flg = 0;
if (semop(semid, operations, 1) < 0)
{
perror("child semop");
exit(1);
}
if (pid != 0)
{
for (i = 0; i < PARENT_INCREMENT_COUNT; i++)
{
operations[0].sem_num = 0;
operations[0].sem_op = -1;
operations[0].sem_flg = 0;
NP Lab Manual , RNEC page: 21