/* There shall be one task, called lift_task, for the lift. */
void lift_task(void)//TODO
{
int next;
int dirchange;
int send_task_id;
int length;//DUMMY
message_data_type msg;
draw_lift(mainlift);
while (1)
{
si_message_receive((char *) &msg, &length, &send_task_id);
if(msg.type == MOVE_MESSAGE)
{
lift_next_floor(mainlift, &next, &dirchange);
lift_move(mainlift, next, dirchange);
lift_has_arrived(mainlift);
}
else if(msg.type == TRAVEL_MESSAGE)
{
/* a travel message is sent to the lift task when a
person would like to make a lift travel */
enter_floor(mainlift, msg.id, msg.from_floor, msg.to_floor);
}
draw_lift(mainlift);
}
}
/* MONITOR function lift_travel: performs a journey with the lift
starting at from_floor, and ending at to_floor */
void lift_travel(lift_type lift, int id, int from_floor, int to_floor) {
pthread_mutex_lock(&lift->mutex);
enter_floor(lift, id, from_floor);
// vänta på att lift has arrived cv
while(1) {
pthread_cond_wait(&lift->change, &lift->mutex);
if(lift->floor == from_floor) {
// försök att gå in i liften
if (enter_lift(lift, id, from_floor, to_floor)) {
draw_lift(lift);
pthread_cond_broadcast(&lift->change);
break;
}
}
}
// vänta på att liften har nått rätt våning
while(1) {
pthread_cond_wait(&lift->change, &lift->mutex);
if(lift->floor == to_floor) {
if (leave_lift(lift, id, to_floor)) {
draw_lift(lift);
pthread_cond_broadcast(&lift->change);
break;
}
}
}
pthread_mutex_unlock(&lift->mutex);
}
void lift_move(lift_type lift, int next_floor, int change_direction)
{
/* reserve lift */
pthread_mutex_lock(&lift->mutex);
/* the lift is moving */
lift->moving = 1;
/* release lift */
pthread_mutex_unlock(&lift->mutex);
/* it takes two seconds to move to the next floor */
usleep(1000000);
/* reserve lift */
pthread_mutex_lock(&lift->mutex);
/* the lift is not moving */
lift->moving = 0;
/* the lift has arrived at next_floor */
lift->floor = next_floor;
/* check if direction shall be changed */
if (change_direction)
{
lift->up = !lift->up;
}
/* draw, since a change has occurred */
draw_lift(lift);
/* release lift */
pthread_mutex_unlock(&lift->mutex);
}
// This process is responsible for drawing the lift. Receives lift_type structures
// as messages.
void uidraw_process(void) {
char msg[1024];
si_ui_set_size(670, 700);
while(1) {
message_receive(msg, 1024, QUEUE_UI);
lift_type Lift = (lift_type) &msg[0];
draw_lift(Lift);
}
}
/* There shall be one task, called lift_task, for the lift. */
void lift_task(void)
{
int next;
int dirchange;
draw_lift(mainlift);
while (1)
{
lift_next_floor(mainlift, &next, &dirchange);
lift_move(mainlift, next, dirchange);
lift_has_arrived(mainlift);
/* För debug
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_next_floor(mainlift, &next, &dirchange);
printf("|%d %d %d |", mainlift->floor, next, dirchange);
lift_move(mainlift, next, dirchange);
lift_has_arrived(mainlift);
printf("| %d %d |", next, dirchange);
exit(mainlift->floor);
*/
}
}
