1#ifndef FIO_IO_U_QUEUE 2#define FIO_IO_U_QUEUE 3 4#include <assert.h> 5 6struct io_u; 7 8struct io_u_queue { 9 struct io_u **io_us; 10 unsigned int nr; 11}; 12 13static inline struct io_u *io_u_qpop(struct io_u_queue *q) 14{ 15 if (q->nr) 16 return q->io_us[--q->nr]; 17 18 return NULL; 19} 20 21static inline void io_u_qpush(struct io_u_queue *q, struct io_u *io_u) 22{ 23 q->io_us[q->nr++] = io_u; 24} 25 26static inline int io_u_qempty(struct io_u_queue *q) 27{ 28 return !q->nr; 29} 30 31#define io_u_qiter(q, io_u, i) \ 32 for (i = 0; i < (q)->nr && (io_u = (q)->io_us[i]); i++) 33 34int io_u_qinit(struct io_u_queue *q, unsigned int nr); 35void io_u_qexit(struct io_u_queue *q); 36 37struct io_u_ring { 38 unsigned int head; 39 unsigned int tail; 40 unsigned int max; 41 struct io_u **ring; 42}; 43 44int io_u_rinit(struct io_u_ring *ring, unsigned int nr); 45void io_u_rexit(struct io_u_ring *ring); 46 47static inline void io_u_rpush(struct io_u_ring *r, struct io_u *io_u) 48{ 49 if (r->head + 1 != r->tail) { 50 r->ring[r->head] = io_u; 51 r->head = (r->head + 1) & (r->max - 1); 52 return; 53 } 54 55 assert(0); 56} 57 58static inline struct io_u *io_u_rpop(struct io_u_ring *r) 59{ 60 if (r->head != r->tail) { 61 struct io_u *io_u = r->ring[r->tail]; 62 63 r->tail = (r->tail + 1) & (r->max - 1); 64 return io_u; 65 } 66 67 return NULL; 68} 69 70static inline int io_u_rempty(struct io_u_ring *ring) 71{ 72 return ring->head == ring->tail; 73} 74 75#endif 76