stdatomic.h - mozsearch

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/*

* 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  atomic_int;

typedef volatile ULONG 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_exchange(p_a, v)       InterlockedExchange(p_a, v)

#define atomic_load_explicit(p_a, mo) atomic_load(p_a)

static inline int atomic_compare_exchange_strong_int(LONG *obj, LONG *expected,

                                                     LONG desired)

    LONG orig = *expected;

    *expected = InterlockedCompareExchange(obj, desired, orig);

    return *expected == orig;

#define atomic_compare_exchange_strong(p_a, expected, desired) atomic_compare_exchange_strong_int((LONG *)p_a, (LONG *)expected, (LONG)desired)

/*

 * 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))

#define atomic_fetch_or(p_a, v)       InterlockedOr(p_a, v)

#define atomic_fetch_add_explicit(p_a, inc, mo) atomic_fetch_add(p_a, inc)

#endif /* ! stdatomic.h */

#pragma warning(pop)

#endif /* !defined(__cplusplus) && defined(_MSC_VER) */

#endif /* MSCVER_STDATOMIC_H_ */