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Kitware
GitHub Repository: Kitware/CMake
 Path: blob/master/Utilities/cmlibuv/src/win/atomicops-inl.h
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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.

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 *

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 * Permission is hereby granted, free of charge, to any person obtaining a copy

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 * of this software and associated documentation files (the "Software"), to

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 * deal in the Software without restriction, including without limitation the

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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

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 * sell copies of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 *

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 * The above copyright notice and this permission notice shall be included in

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 * all copies or substantial portions of the Software.

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 *

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

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 * IN THE SOFTWARE.

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 */

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#ifndef UV_WIN_ATOMICOPS_INL_H_

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#define UV_WIN_ATOMICOPS_INL_H_

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#include "uv.h"

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#include "internal.h"

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/* Atomic set operation on char */

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#ifdef _MSC_VER /* MSVC */

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/* _InterlockedOr8 is supported by MSVC on x32 and x64. It is slightly less

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 * efficient than InterlockedExchange, but InterlockedExchange8 does not exist,

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 * and interlocked operations on larger targets might require the target to be

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 * aligned. */

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#pragma intrinsic(_InterlockedOr8)

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static char INLINE uv__atomic_exchange_set(char volatile* target) {

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  return _InterlockedOr8(target, 1);

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}

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#else /* GCC, Clang in mingw mode */

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static inline char uv__atomic_exchange_set(char volatile* target) {

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#if defined(__i386__) || defined(__x86_64__)

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  /* Mingw-32 version, hopefully this works for 64-bit gcc as well. */

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  const char one = 1;

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  char old_value;

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  __asm__ __volatile__ ("lock xchgb %0, %1\n\t"

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                        : "=r"(old_value), "=m"(*target)

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                        : "0"(one), "m"(*target)

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                        : "memory");

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  return old_value;

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#else

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  return __sync_fetch_and_or(target, 1);

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#endif

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}

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#endif

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#endif /* UV_WIN_ATOMICOPS_INL_H_ */

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