typedef pthread_mutex_t q_lock;
typedef int element;
typedef struct queue
{
    struct node *front, *rear;
    q_lock lock;
}queue;

typedef struct node
{
    element data;
    struct node *next;

}node;

queue* new_q();
void del_q(queue *q);
void put_q(queue *q, element data);
element *get_q(queue *q, element *d);
void print_q(queue *q);
int empty_q(queue *q);