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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdlib.h>
#include <string.h>
#include "pico/util/queue.h"
void queue_init_with_spinlock(queue_t *q, uint element_size, uint element_count, uint spinlock_num) {
q->lock = spin_lock_instance(spinlock_num);
q->data = (uint8_t *)calloc(element_count + 1, element_size);
q->element_count = element_count;
q->element_size = element_size;
q->wptr = 0;
q->rptr = 0;
}
void queue_free(queue_t *q) {
free(q->data);
}
static inline void *element_ptr(queue_t *q, uint index) {
assert(index <= q->element_count);
return q->data + index * q->element_size;
}
static inline uint16_t inc_index(queue_t *q, uint16_t index) {
if (++index > q->element_count) { // > because we have element_count + 1 elements
index = 0;
}
return index;
}
bool queue_try_add(queue_t *q, void *data) {
bool success = false;
uint32_t flags = spin_lock_blocking(q->lock);
if (queue_get_level_unsafe(q) != q->element_count) {
memcpy(element_ptr(q, q->wptr), data, q->element_size);
q->wptr = inc_index(q, q->wptr);
success = true;
}
spin_unlock(q->lock, flags);
if (success) __sev();
return success;
}
bool queue_try_remove(queue_t *q, void *data) {
bool success = false;
uint32_t flags = spin_lock_blocking(q->lock);
if (queue_get_level_unsafe(q) != 0) {
memcpy(data, element_ptr(q, q->rptr), q->element_size);
q->rptr = inc_index(q, q->rptr);
success = true;
}
spin_unlock(q->lock, flags);
if (success) __sev();
return success;
}
bool queue_try_peek(queue_t *q, void *data) {
bool success = false;
uint32_t flags = spin_lock_blocking(q->lock);
if (queue_get_level_unsafe(q) != 0) {
memcpy(data, element_ptr(q, q->rptr), q->element_size);
success = true;
}
spin_unlock(q->lock, flags);
return success;
}
void queue_add_blocking(queue_t *q, void *data) {
bool done;
do {
done = queue_try_add(q, data);
if (done) break;
__wfe();
} while (true);
}
void queue_remove_blocking(queue_t *q, void *data) {
bool done;
do {
done = queue_try_remove(q, data);
if (done) break;
__wfe();
} while (true);
}
void queue_peek_blocking(queue_t *q, void *data) {
bool done;
do {
done = queue_try_peek(q, data);
if (done) break;
__wfe();
} while (true);
}
|
