ref: 19b4c9c076c5542901871be2b50d9084980cffce
dir: /include/compat/msvc/stdatomic.h/
/*
* Copyright © 2018, VideoLAN and dav1d authors
* 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.
*
* 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 OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MSCVER_STDATOMIC_H_
#define MSCVER_STDATOMIC_H_
#if !defined(__cplusplus) && defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable:4067) /* newline for __has_include_next */
#if defined(__clang__) && __has_include_next(<stdatomic.h>)
/* use the clang stdatomic.h with clang-cl*/
# include_next <stdatomic.h>
#else /* ! stdatomic.h */
#include <windows.h>
#include "common/attributes.h"
typedef volatile LONG __declspec(align(32)) atomic_int;
typedef volatile ULONG __declspec(align(32)) atomic_uint;
typedef enum {
memory_order_relaxed,
memory_order_acquire
} msvc_atomic_memory_order;
#define atomic_init(p_a, v) do { *(p_a) = (v); } while(0)
#define atomic_store(p_a, v) InterlockedExchange((LONG*)p_a, v)
#define atomic_load(p_a) InterlockedCompareExchange((LONG*)p_a, 0, 0)
#define atomic_load_explicit(p_a, mo) atomic_load(p_a)
/*
* TODO use a special call to increment/decrement
* using InterlockedIncrement/InterlockedDecrement
*/
#define atomic_fetch_add(p_a, inc) InterlockedExchangeAdd(p_a, inc)
#define atomic_fetch_sub(p_a, dec) InterlockedExchangeAdd(p_a, -(dec))
#endif /* ! stdatomic.h */
#pragma warning(pop)
#endif /* !defined(__cplusplus) && defined(_MSC_VER) */
#endif /* MSCVER_STDATOMIC_H_ */