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*); 10