81 lines
3.5 KiB
C
81 lines
3.5 KiB
C
/*******************************************************************************
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* @file
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* @brief Implementation of atomic operations.
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*******************************************************************************
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* # License
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* <b>Copyright 2019 Silicon Laboratories Inc. www.silabs.com</b>
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*******************************************************************************
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*
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* SPDX-License-Identifier: Zlib
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*
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* The licensor of this software is Silicon Laboratories Inc.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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******************************************************************************/
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#ifndef SL_ATOMIC_H
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#define SL_ATOMIC_H
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/*******************************************************************************
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* @addtogroup atomic Atomic Operations
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* @brief Atomic operations provide RAM store and read functionalities.
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* @n @section atomic_usage Atomic Operations Usage
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @brief Perform an atomic load. Use when a variable must be read from
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* RAM.
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*
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* @param dest Variable where to copy the loaded value.
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*
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* @param source Variable from where to load the value.
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*
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* @note Does only support native types <= 32 bits.
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*
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* @note Load operation on 32 bit value is atomic on ARM architecture.
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*
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* @note Only the load operation from 'source' is guaranteed to be
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* performed atomically. If writing to 'dest' implies a store,
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* the load and store operations are not guaranteed to be
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* performed atomically.
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******************************************************************************/
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#define sl_atomic_load(dest, source) ((dest) = (source))
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/*******************************************************************************
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* @brief Perform an atomic store. Use when a value must be stored in
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* RAM.
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*
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* @param dest Variable where to store the value.
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*
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* @param source Variable that contains the value to store in 'dest'.
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*
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* @note Does only support native types <= 32 bits.
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*
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* @note Store operation on 32 bit value is atomic on ARM architecture.
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*
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* @note Only the store operation to 'dest' is guaranteed to be
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* performed atomically. If reading from 'source' implies a load,
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* the store and load operations are not guaranteed to be
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* performed atomically.
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******************************************************************************/
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#define sl_atomic_store(dest, source) ((dest) = (source))
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/** @} (end addtogroup atomic) */
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#endif /* SL_ATOMIC_H */
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