third_party/NordicSemiconductor/nrfx/soc/nrfx_atomic.h

/*
 * Copyright (c) 2016 - 2019, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#ifndef NRFX_ATOMIC_H__
#define NRFX_ATOMIC_H__

#include <nrfx.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup nrfx_atomic Atomic operations API
 * @ingroup nrfx
 * @{
 *
 * @brief This module implements C11 stdatomic.h simplified API.
 *
 * At this point, only Cortex-M3 and M4 cores are supported (LDREX/STREX instructions).
 * Atomic types are limited to @ref nrfx_atomic_u32_t and @ref nrfx_atomic_flag_t.
 */


/**
 * @brief Atomic 32-bit unsigned type.
 */
typedef volatile uint32_t nrfx_atomic_u32_t;

/**
 * @brief Atomic 1-bit flag type (technically 32-bit).
 */
typedef volatile uint32_t nrfx_atomic_flag_t;

/**
 * @brief Function for storing a value to an atomic object and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value to store.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_store(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for storing a value to an atomic object and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value to store.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_store(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical OR operation on an atomic object
 *        and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the OR operation.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_or(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical OR operation on an atomic object
 *        and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the OR operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_or(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical AND operation on an atomic object
 *        and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the AND operation.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_and(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical AND operation on an atomic object
 *        and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the AND operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_and(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical XOR operation on an atomic object
 *        and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the XOR operation.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_xor(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical XOR operation on an atomic object
 *        and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the XOR operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_xor(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running an arithmetic ADD operation on an atomic object
 *        and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the ADD operation.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_add(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running an arithmetic ADD operation on an atomic object
 *        and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the ADD operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_add(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running an arithmetic SUB operation on an atomic object
 *        and returning its previous value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the SUB operation.
 *
 * @return Old value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_sub(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running an arithmetic SUB operation on an atomic object 
 *        and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the SUB operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_sub(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for atomic conditional value replacement.
 *
 * Atomically compares the value pointed to by @p p_data with the value pointed to by @p p_expected.
 * If those are equal, replaces the former with desired. Otherwise, loads the actual value
 * pointed to by @p p_data into @p *p_expected.
 *
 * @param p_data     Atomic memory pointer to test and modify.
 * @param p_expected Pointer to the test value.
 * @param desired    Value to be stored to atomic memory.
 *
 * @retval true  @p *p_data was equal to @p *p_expected.
 * @retval false @p *p_data was not equal to @p *p_expected.
 */
bool nrfx_atomic_u32_cmp_exch(nrfx_atomic_u32_t * p_data,
                              uint32_t *         p_expected,
                              uint32_t           desired);

/**
 * @brief Function for running an arithmetic SUB operation on an atomic object
 *        if object >= value, and returning its previous value.
 *        
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the SUB operation.
 *
 * @return Previous value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_fetch_sub_hs(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running an arithmetic SUB operation on an atomic object 
 *        if object >= value, and returning its new value.
 *
 * @param[in] p_data    Atomic memory pointer.
 * @param[in] value     Value of the second operand in the SUB operation.
 *
 * @return New value stored in the atomic object.
 */
uint32_t nrfx_atomic_u32_sub_hs(nrfx_atomic_u32_t * p_data, uint32_t value);

/**
 * @brief Function for running a logical one bit flag set operation 
 *        on an atomic object and returning its previous value.
 *
 * @param[in] p_data    Atomic flag memory pointer.
 *
 * @return Previous flag value.
 */
uint32_t nrfx_atomic_flag_set_fetch(nrfx_atomic_flag_t * p_data);

/**
 * @brief Function for running a logical one bit flag set operation 
 *        on an atomic object and returning its new value.
 *
 * @param[in] p_data    Atomic flag memory pointer.
 *
 * @return New flag value.
 */
uint32_t nrfx_atomic_flag_set(nrfx_atomic_flag_t * p_data);

/**
 * @brief Function for running a logical one bit flag clear operation 
 *        on an atomic object and returning its previous value.
 *
 * @param[in] p_data    Atomic flag memory pointer.
 *
 * @return Previous flag value.
 */
uint32_t nrfx_atomic_flag_clear_fetch(nrfx_atomic_flag_t * p_data);

/**
 * @brief Function for running a logical one bit flag clear operation 
 *        on an atomic object and returning its new value.
 *
 * @param[in] p_data    Atomic flag memory pointer.
 *
 * @return New flag value.
 */
uint32_t nrfx_atomic_flag_clear(nrfx_atomic_flag_t * p_data);

/** @} */

#ifdef __cplusplus
}
#endif

#endif // NRFX_ATOMIC_H__