80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/*
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* Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* @file generic/mutex.h
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* @brief Generic mutex primitives for libmetal.
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*/
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#ifndef __METAL_MUTEX__H__
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#error "Include metal/mutex.h instead of metal/generic/mutex.h"
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#endif
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#ifndef __METAL_GENERIC_MUTEX__H__
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#define __METAL_GENERIC_MUTEX__H__
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#include <metal/atomic.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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union{
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atomic_int v;
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atomic_flag w;
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};
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} metal_mutex_t;
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/*
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* METAL_MUTEX_INIT - used for initializing an mutex elmenet in a static struct
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* or global
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*/
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#define METAL_MUTEX_INIT(m) { ATOMIC_VAR_INIT(0) }
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/*
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* METAL_MUTEX_DEFINE - used for defining and initializing a global or
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* static singleton mutex
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*/
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#define METAL_MUTEX_DEFINE(m) metal_mutex_t m = METAL_MUTEX_INIT(m)
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static inline void __metal_mutex_init(metal_mutex_t *mutex)
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{
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atomic_store(&mutex->v, 0);
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}
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static inline void __metal_mutex_deinit(metal_mutex_t *mutex)
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{
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(void)mutex;
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}
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static inline int __metal_mutex_try_acquire(metal_mutex_t *mutex)
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{
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return 1 - atomic_flag_test_and_set(&mutex->w);
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}
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static inline void __metal_mutex_acquire(metal_mutex_t *mutex)
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{
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while (atomic_flag_test_and_set(&mutex->w)) {
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;
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}
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}
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static inline void __metal_mutex_release(metal_mutex_t *mutex)
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{
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atomic_flag_clear(&mutex->w);
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}
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static inline int __metal_mutex_is_acquired(metal_mutex_t *mutex)
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{
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return atomic_load(&mutex->v);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __METAL_GENERIC_MUTEX__H__ */
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