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