Traffic Control Problem
NS-cars.c
and EW-cars.c
are two programs that simulate traffic control. When north-south cars pass the crossroads, they should ensure that road from north to south is available, if north-south road is not available, they keep waiting. This is the same to east-west cars. Note that when north-south road is available, east-west road is not available and vice versa.
Please add semaphore synchronization in these two programs so that north-south cars and east-west cars can pass the crossroads alternately and there will not be car accident.
/*NS-cars.c*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
int i, car = 0, loop = 3;
for (i = 0; i < loop; i++) {
printf("Semaphore: The road from north to south is open\n");
sleep(1);
printf("NS-Car: car %d passed\n", car++);
}
printf("NS: Time is up. %d cars passed.\n", car);
return 0;
}
/*EW-cars.c*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[]) {
int i, car = 0, loop = 3;
for (i = 0; i < loop; i++) {
printf("Semaphore: The road from east to west is open\n");
sleep(rand() % 2 + 1);
printf("EW-Car: car %d passed\n", car++);
}
printf("EW: Time is up. %d cars passed.\n", car);
return 0;
}
Last updated
Was this helpful?