fixed_queue
int fixed_queue_init(fixed_queue *q, int size);
void fixed_queue_destroy(fixed_queue *q);
int fixed_queue_enqueue(fixed_queue *q, void *e);
void *fixed_queue_dequeue(fixed_queue *q);
void *fixed_queue_peek(fixed_queue *q);
fixed_queue_init(fixed_queue *q, int size)
fixed_queue_destroy(fixed_queue *q)
fixed_queue_enqueue(fixed_queue *q, void *e)
fixed_queue_dequeue(fixed_queue *q)
fixed_queue_peek(fixed_queue *q)