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Libs/platform/common/inc/sl_atomic.h

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