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