blob: 99dc0d814fc23e88d562481cc5f9c1b9a4d28e2e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "util.h"
typedef int T;
struct ring_buffer {
int head, tail;
T array[8]; /* fit for your needs... */
};
void
ring_init(struct ring_buffer *rb)
{
rb->head = rb->tail = 0;
}
bool
ring_put(struct ring_buffer *rb, T data)
{
const int next = (rb->head + 1) % NELEM(rb->array);
if ( next == rb->tail )
return false;
rb->array[rb->head] = data;
rb->head = next;
return true;
}
bool
ring_get(struct ring_buffer *rb, T *data)
{
if ( rb->head == rb->tail )
return false;
const int next = (rb->tail + 1) % NELEM(rb->array);
*data = rb->array[rb->tail];
rb->tail = next;
return true;
}
void f() { ERROR(""); }
int
main(void)
{
#if 0
struct ring_buffer rb;
ring_init(&rb);
#else
struct ring_buffer rb = { .head = 0, .tail = 0 };
#endif
for ( int i = 0; i != 30; ++i ) {
if ( !ring_put(&rb, i) )
break;
}
int j;
while ( ring_get(&rb, &j) ) {
printf("%d\n", j);
}
return EXIT_SUCCESS;
}
|
