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71 lines
1.9 KiB
71 lines
1.9 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _ATOMIC_H_
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#define _ATOMIC_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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/* almost all platforms support byte and 32-bit operations of this sort. please do not add other sizes here */
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uint32_t atomicXchgByte(volatile uint8_t *byte, uint32_t newVal);
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uint32_t atomicXchg32bits(volatile uint32_t *word, uint32_t newVal);
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bool atomicCmpXchgByte(volatile uint8_t *byte, uint32_t prevVal, uint32_t newVal);
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bool atomicCmpXchg32bits(volatile uint32_t *word, uint32_t prevVal, uint32_t newVal);
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//returns old value
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uint32_t atomicAddByte(volatile uint8_t *byte, uint32_t addend);
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uint32_t atomicAdd32bits(volatile uint32_t *word, uint32_t addend);
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// pull in inline cpu-specific implementations, if any
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#include <cpu/atomic.h>
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#include <cpu/barrier.h>
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//writes with barriers
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static inline uint32_t atomicReadByte(volatile uint8_t *byte)
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{
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mem_reorder_barrier();
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return *byte;
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}
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static inline uint32_t atomicRead32bits(volatile uint32_t *word)
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{
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mem_reorder_barrier();
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return *word;
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}
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static inline void atomicWriteByte(volatile uint8_t *byte, uint32_t val)
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{
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*byte = val;
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mem_reorder_barrier();
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}
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static inline void atomicWrite32bits(volatile uint32_t *word, uint32_t val)
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{
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*word = val;
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mem_reorder_barrier();
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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