1 typedef struct Queue Queue;
2 Queue *_vtqalloc(void);
3 int _vtqsend(Queue*, void*);
4 void *_vtqrecv(Queue*);
5 void _vtqhangup(Queue*);
6 void *_vtnbqrecv(Queue*);
7 void _vtqdecref(Queue*);
8 Queue *_vtqincref(Queue*);