1 /*
2 * Copyright (c) 2017, Linaro Limited. and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 /*
8 * @file zephyr/mutex.h
9 * @brief Zephyr mutex primitives for libmetal.
10 */
11
12 #ifndef __METAL_MUTEX__H__
13 #error "Include metal/mutex.h instead of metal/zephyr/mutex.h"
14 #endif
15
16 #ifndef __METAL_ZEPHYR_MUTEX__H__
17 #define __METAL_ZEPHYR_MUTEX__H__
18
19 #include <metal/atomic.h>
20 #include <zephyr/kernel.h>
21
22 #ifdef __cplusplus
23 extern "C" {
24 #endif
25
26 typedef struct k_sem metal_mutex_t;
27
28 /*
29 * METAL_MUTEX_INIT - used for initializing an mutex element in a static struct
30 * or global
31 */
32 #define METAL_MUTEX_INIT(m) _K_SEM_INITIALIZER(m, 1, 1)
33 /*
34 * METAL_MUTEX_DEFINE - used for defining and initializing a global or
35 * static singleton mutex
36 */
37 #define METAL_MUTEX_DEFINE(m) K_SEM_DEFINE(m, 1, 1)
38
__metal_mutex_init(metal_mutex_t * m)39 static inline void __metal_mutex_init(metal_mutex_t *m)
40 {
41 k_sem_init(m, 1, 1);
42 }
43
__metal_mutex_deinit(metal_mutex_t * m)44 static inline void __metal_mutex_deinit(metal_mutex_t *m)
45 {
46 (void)m;
47 }
48
__metal_mutex_try_acquire(metal_mutex_t * m)49 static inline int __metal_mutex_try_acquire(metal_mutex_t *m)
50 {
51 int key = irq_lock(), ret = 1;
52
53 if (m->count) {
54 m->count = 0;
55 ret = 0;
56 }
57
58 irq_unlock(key);
59
60 return ret;
61 }
62
__metal_mutex_is_acquired(metal_mutex_t * m)63 static inline int __metal_mutex_is_acquired(metal_mutex_t *m)
64 {
65 int key = irq_lock(), ret;
66
67 ret = m->count;
68
69 irq_unlock(key);
70
71 return ret;
72 }
73
__metal_mutex_acquire(metal_mutex_t * m)74 static inline void __metal_mutex_acquire(metal_mutex_t *m)
75 {
76 k_sem_take(m, K_FOREVER);
77 }
78
__metal_mutex_release(metal_mutex_t * m)79 static inline void __metal_mutex_release(metal_mutex_t *m)
80 {
81 k_sem_give(m);
82 }
83
84 #ifdef __cplusplus
85 }
86 #endif
87
88 #endif /* __METAL_ZEPHYR_MUTEX__H__ */
89
