spinlock.h

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/*
 * Copyright (c) 2016, Xilinx Inc. and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
 
/*
 * @file        spinlock.h
 * @brief       Spinlock primitives for libmetal.
 */
 
#ifndef __METAL_SPINLOCK__H__
#define __METAL_SPINLOCK__H__
 
#include <metal/atomic.h>
#include <metal/cpu.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct metal_spinlock {
        atomic_int v;
};
 
#define METAL_SPINLOCK_INIT             {ATOMIC_VAR_INIT(0)}
 
static inline void metal_spinlock_init(struct metal_spinlock *slock)
{
        atomic_store(&slock->v, 0);
}
 
static inline void metal_spinlock_acquire(struct metal_spinlock *slock)
{
        while (atomic_flag_test_and_set(&slock->v)) {
                metal_cpu_yield();
        }
}
 
static inline void metal_spinlock_release(struct metal_spinlock *slock)
{
        atomic_flag_clear(&slock->v);
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* __METAL_SPINLOCK__H__ */