static void sail_test() {
check_expect_i(sail(AMERICA, EAST), EUROPE);
check_expect_i(sail(EUROPE, WEST), AMERICA);
check_expect_i(sail(EUROPE, SOUTH), AFRICA);
check_expect_i(sail(AFRICA, NORTH), EUROPE);
check_expect_i(sail(AMERICA, SOUTH), NOWHERE);
check_expect_i(sail(AFRICA, EAST), NOWHERE);
check_expect_i(sail(NOWHERE, NORTH), NOWHERE);
check_expect_i(sail(NOWHERE, WEST), NOWHERE);
}
/**
* Boat thread.
*/
void *thr_boat(void *ptr)
{
boat_t *boat = (boat_t*) ptr;
int i;
while (!dock_is_closed()) {
// if no available spots at bay, sail for a bit
if (sem_trywait(&sem_dock) == 0) {
printf("[B%02d] entered bay.\n", boat->id);
// look for an available anchorage
for (i = 0; !dock_is_closed(); i = (i+1) % ANCHORAGES) {
if (enter_anchorage(i, boat)) {
// wait until crane is available for moving cargo
wait_for_crane(i, boat);
// trigger crane to move cargo
printf("[B%02d] will start unloading (%d)/loading in [A%d].\n", boat->id, boat->cargo, i);
sem_post(&sem_start_cargo[i]);
// at this point, the crane is being occupied,
// leaving the waiting spot vacant
sem_post(&sem_enter_anchorage[i]);
// wait until moving cargo is finished and leave
sem_wait(&sem_end_cargo[i]);
// now the crane is avaible for the next boat
leave_crane(i, boat->id);
printf("[B%02d] left [A%d].\n", boat->id, i);
break;
}
sleep(1); // wait 1 sec to avoid some race conditions
}
// boat leaving dock, so the spot is vacant
sem_post(&sem_dock);
}
sail(boat->id);
}
printf(">>>>> The dock is closed. [B%02d] is on its way.\n", boat->id);
return NULL;
}
