72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
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* Copyright (c) 2016, 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 spinlock.h
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* @brief Spinlock primitives for libmetal.
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*/
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#ifndef __METAL_SPINLOCK__H__
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#define __METAL_SPINLOCK__H__
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#include <metal/atomic.h>
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#include <metal/cpu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \defgroup spinlock Spinlock Interfaces
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* @{ */
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struct metal_spinlock {
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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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};
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/** Static metal spinlock initialization. */
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#define METAL_SPINLOCK_INIT {ATOMIC_VAR_INIT(0)}
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/**
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* @brief Initialize a libmetal spinlock.
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* @param[in] slock Spinlock to initialize.
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*/
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static inline void metal_spinlock_init(struct metal_spinlock *slock)
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{
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atomic_store(&slock->v, 0);
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}
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/**
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* @brief Acquire a spinlock.
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* @param[in] slock Spinlock to acquire.
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* @see metal_spinlock_release
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*/
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static inline void metal_spinlock_acquire(struct metal_spinlock *slock)
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{
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while (atomic_flag_test_and_set(&slock->w)) {
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metal_cpu_yield();
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}
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}
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/**
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* @brief Release a previously acquired spinlock.
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* @param[in] slock Spinlock to release.
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* @see metal_spinlock_acquire
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*/
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static inline void metal_spinlock_release(struct metal_spinlock *slock)
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{
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atomic_flag_clear(&slock->w);
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}
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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_SPINLOCK__H__ */
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