1 #include <stdlib.h>
2 #include "io_u_queue.h"
3 
io_u_qinit(struct io_u_queue * q,unsigned int nr)4 int io_u_qinit(struct io_u_queue *q, unsigned int nr)
5 {
6 	q->io_us = calloc(nr, sizeof(struct io_u *));
7 	if (!q->io_us)
8 		return 1;
9 
10 	q->nr = 0;
11 	q->max = nr;
12 	return 0;
13 }
14 
io_u_qexit(struct io_u_queue * q)15 void io_u_qexit(struct io_u_queue *q)
16 {
17 	free(q->io_us);
18 }
19 
io_u_rinit(struct io_u_ring * ring,unsigned int nr)20 int io_u_rinit(struct io_u_ring *ring, unsigned int nr)
21 {
22 	ring->max = nr + 1;
23 	if (ring->max & (ring->max - 1)) {
24 		ring->max--;
25 		ring->max |= ring->max >> 1;
26 		ring->max |= ring->max >> 2;
27 		ring->max |= ring->max >> 4;
28 		ring->max |= ring->max >> 8;
29 		ring->max |= ring->max >> 16;
30 		ring->max++;
31 	}
32 
33 	ring->ring = calloc(ring->max, sizeof(struct io_u *));
34 	if (!ring->ring)
35 		return 1;
36 
37 	ring->head = ring->tail = 0;
38 	return 0;
39 }
40 
io_u_rexit(struct io_u_ring * ring)41 void io_u_rexit(struct io_u_ring *ring)
42 {
43 	free(ring->ring);
44 }
45