void putdown_chopsticks(int phil_id){
/*Use putdown_chopstick to put down the chopsticks*/
/*Your code here*/
if(phil_id % 2 == 0){
putdown_one_chopstick(phil_to_chopstick(phil_id, left), phil_id);
putdown_one_chopstick(phil_to_chopstick(phil_id, right), phil_id);
}
else{
putdown_one_chopstick(phil_to_chopstick(phil_id, right), phil_id);
putdown_one_chopstick(phil_to_chopstick(phil_id, left), phil_id);
}
}
void pickup_chopsticks(int phil_id){
/*Use
pickup_chopstick(phil_to_chopstick(phil_id, right), phil_id);
and
pickup_chopstick(phil_to_chopstick(phil_id, left), phil_id);
to pickup the right and left chopsticks. Beware of deadlock!
*/
/*Your code here*/
if(phil_id % 2 == 0){
pickup_one_chopstick(phil_to_chopstick(phil_id, left), phil_id);
pickup_one_chopstick(phil_to_chopstick(phil_id, right), phil_id);
}
else{
pickup_one_chopstick(phil_to_chopstick(phil_id, right), phil_id);
pickup_one_chopstick(phil_to_chopstick(phil_id, left), phil_id);
}
}
/*
* Uses pickup_left_chopstick and pickup_right_chopstick
* to pick up the chopsticks
*/
void pickup_chopsticks(int phil_id){
if(phil_to_chopstick(phil_id, left) < phil_to_chopstick(phil_id, right))
{
pthread_mutex_lock(&chopstick_mutex[phil_to_chopstick(phil_id, left)]);
pickup_left_chopstick(phil_id);
pthread_mutex_lock(&chopstick_mutex[phil_to_chopstick(phil_id, right)]);
pickup_right_chopstick(phil_id);
}
else
{
pthread_mutex_lock(&chopstick_mutex[phil_to_chopstick(phil_id, right)]);
pickup_right_chopstick(phil_id);
pthread_mutex_lock(&chopstick_mutex[phil_to_chopstick(phil_id, left)]);
pickup_left_chopstick(phil_id);
}
}
/*
* Uses pickup_left_chopstick and pickup_right_chopstick
* to pick up the chopsticks
*/
void putdown_chopsticks(int phil_id){
putdown_left_chopstick(phil_id);
pthread_mutex_unlock(&chopstick_mutex[phil_to_chopstick(phil_id, left)]);
putdown_right_chopstick(phil_id);
pthread_mutex_unlock(&chopstick_mutex[phil_to_chopstick(phil_id, right)]);
}
