100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
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/*
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* Copyright (c) 2012, Freescale Semiconductor, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if !defined(__ATOMICS_H__)
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#define __ATOMICS_H__
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#include <stdint.h>
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#include <stdbool.h>
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//! @addtogroup atomics
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//! @{
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////////////////////////////////////////////////////////////////////////////////
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// Code
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////////////////////////////////////////////////////////////////////////////////
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#if defined(__cplusplus)
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extern "C" {
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#endif
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//! @name Atomic operations
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//@{
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//! @brief Atomic compare and swap operation.
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//!
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//! Tests the word pointed to by @a value for equality with @a oldValue. If they are
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//! equal, the word pointed to by @a value is set to @a newValue. If *value is not
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//! equal to @a oldValue, then no change is made. The return value indicates whether
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//! the swap was performed. Of course, this entire operation is guaranteed to be
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//! atomic even on multiprocessor platforms.
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//!
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//! A memory barrier is performed prior to the compare and swap operation.
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//!
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//! @param value Pointer to the word to compare and swap.
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//! @param oldValue Value to compare against.
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//! @param newValue Value to value to swap in if *value is equal to oldValue.
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//! @retval false No change was made to *value.
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//! @retval true The swap was performed, and *value is now equal to newValue.
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bool atomic_compare_and_swap(volatile uint32_t * value, uint32_t oldValue, uint32_t newValue);
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//! @brief Atomic add operation.
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//!
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//! A memory barrier is performed prior to the add operation.
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//!
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//! @param value Pointer to the word to add to.
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//! @param delta Signed value to atomically add to *value.
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//! @return The original value is returned.
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int32_t atomic_add(volatile int32_t * value, int32_t delta);
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//! @brief Atomically increment a value.
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//!
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//! @param value Pointer to the word to increment.
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//! @return The original value is returned.
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int32_t atomic_increment(volatile int32_t * value);
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//! @brief Atomically decrement a value.
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//!
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//! @param value Pointer to the word to decrement.
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//! @return The original value is returned.
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int32_t atomic_decrement(volatile int32_t * value);
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//@}
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#if defined(__cplusplus)
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}
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#endif
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//! @}
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#endif // __ATOMICS_H__
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////////////////////////////////////////////////////////////////////////////////
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// EOF
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////////////////////////////////////////////////////////////////////////////////
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