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1 enum2 {3 MAXQ = 2564 };6 typedef struct Queue Queue;7 struct Queue8 {9 struct {10 Block *db;11 u32int bno;12 } el[MAXQ];13 int ri, wi, nel, closed;15 QLock lk;16 Rendez r;17 };19 Queue *qalloc(void);20 void qclose(Queue*);21 Block *qread(Queue*, u32int*);22 void qwrite(Queue*, Block*, u32int);23 void qfree(Queue*);