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2ae0b204 JA |
1 | #ifndef FIO_IO_U_QUEUE |
2 | #define FIO_IO_U_QUEUE | |
3 | ||
4 | #include <assert.h> | |
5 | ||
6 | struct io_u; | |
7 | ||
8 | struct io_u_queue { | |
9 | struct io_u **io_us; | |
10 | unsigned int nr; | |
11 | }; | |
12 | ||
13 | static inline struct io_u *io_u_qpop(struct io_u_queue *q) | |
14 | { | |
f8b0bd10 JA |
15 | if (q->nr) { |
16 | const unsigned int next = --q->nr; | |
17 | struct io_u *io_u = q->io_us[next]; | |
18 | ||
19 | q->io_us[next] = NULL; | |
20 | return io_u; | |
21 | } | |
2ae0b204 JA |
22 | |
23 | return NULL; | |
24 | } | |
25 | ||
26 | static inline void io_u_qpush(struct io_u_queue *q, struct io_u *io_u) | |
27 | { | |
28 | q->io_us[q->nr++] = io_u; | |
29 | } | |
30 | ||
effd6ff0 | 31 | static inline int io_u_qempty(const struct io_u_queue *q) |
2ae0b204 JA |
32 | { |
33 | return !q->nr; | |
34 | } | |
35 | ||
36 | #define io_u_qiter(q, io_u, i) \ | |
6a7a9215 | 37 | for (i = 0; i < (q)->nr && (io_u = (q)->io_us[i]); i++) |
2ae0b204 JA |
38 | |
39 | int io_u_qinit(struct io_u_queue *q, unsigned int nr); | |
40 | void io_u_qexit(struct io_u_queue *q); | |
41 | ||
42 | struct io_u_ring { | |
43 | unsigned int head; | |
44 | unsigned int tail; | |
45 | unsigned int max; | |
46 | struct io_u **ring; | |
47 | }; | |
48 | ||
49 | int io_u_rinit(struct io_u_ring *ring, unsigned int nr); | |
50 | void io_u_rexit(struct io_u_ring *ring); | |
51 | ||
52 | static inline void io_u_rpush(struct io_u_ring *r, struct io_u *io_u) | |
53 | { | |
54 | if (r->head + 1 != r->tail) { | |
55 | r->ring[r->head] = io_u; | |
56 | r->head = (r->head + 1) & (r->max - 1); | |
57 | return; | |
58 | } | |
59 | ||
60 | assert(0); | |
61 | } | |
62 | ||
63 | static inline struct io_u *io_u_rpop(struct io_u_ring *r) | |
64 | { | |
65 | if (r->head != r->tail) { | |
66 | struct io_u *io_u = r->ring[r->tail]; | |
67 | ||
68 | r->tail = (r->tail + 1) & (r->max - 1); | |
69 | return io_u; | |
70 | } | |
71 | ||
72 | return NULL; | |
73 | } | |
74 | ||
75 | static inline int io_u_rempty(struct io_u_ring *ring) | |
76 | { | |
77 | return ring->head == ring->tail; | |
78 | } | |
79 | ||
80 | #endif |