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/*
* Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/*
* @file generic/mutex.h
* @brief Generic mutex primitives for libmetal.
*/
#ifndef __METAL_GENERIC_MUTEX__H__
#define __METAL_GENERIC_MUTEX__H__
#include <stdatomic.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
atomic_int v;
} metal_mutex_t;
/*
* METAL_MUTEX_INIT - used for initializing an mutex elmenet in a static struct
* or global
*/
#define METAL_MUTEX_INIT(m) { ATOMIC_VAR_INIT(0) }
/*
* METAL_MUTEX_DEFINE - used for defining and initializing a global or
* static singleton mutex
*/
#define METAL_MUTEX_DEFINE(m) metal_mutex_t m = METAL_MUTEX_INIT(m)
static inline void metal_mutex_init(metal_mutex_t *mutex)
{
atomic_store(&mutex->v, 0);
}
static inline void __metal_mutex_deinit(metal_mutex_t *mutex)
{
(void)mutex;
}
static inline int metal_mutex_try_acquire(metal_mutex_t *mutex)
{
return 1 - atomic_flag_test_and_set(&mutex->v);
}
static inline void metal_mutex_acquire(metal_mutex_t *mutex)
{
while (atomic_flag_test_and_set(&mutex->v)) {
;
}
}
static inline void metal_mutex_release(metal_mutex_t *mutex)
{
atomic_flag_clear(&mutex->v);
}
static inline int metal_mutex_is_acquired(metal_mutex_t *mutex)
{
return atomic_load(&mutex->v);
}
#ifdef __cplusplus
}
#endif
#endif /* __METAL_GENERIC_MUTEX__H__ */
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