Added useful comment and updated print statement

cars_1.c

@@ -37,7 +37,7 @@ void* func(void* ptr){
     while (crosses_counter < crosses){
         lock(car_id);
         while (car_on_bridge == Bridge_Capacity){}
-        printf("Car %d has crossed the bridge\n",car_id);
+        printf("Car %d is crossing the bridge\n",car_id);
         car_on_bridge ++;
         usleep(10000);
         car_on_bridge --;
@@ -45,6 +45,7 @@ void* func(void* ptr){
         crosses_counter++;
         unlock(car_id);
     //**********CRITICAL SECTION**********//
+    //The thread acquires the lock before it enters the ciritical section. If there is a car on the bridge (another thread has the lock) then we wait. While the car is crossing, we increment he car_on_bridge by 1, reaching bridge capacity.We simulate the crossing bridge time using usleep.The car crosses, we decrement the car_on_bridge and print out a message that the car has crossed, then we increment the crosses_counter and release the lock so that it can be obtained by other cars(threads).
     }
     return NULL;
 }