/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.

 *

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

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

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

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

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

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

 *

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

 * all copies or substantial portions of the Software.

 *

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

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

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

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

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

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

 * IN THE SOFTWARE.

 */

#ifndef UV_WIN_ATOMICOPS_INL_H_

#define UV_WIN_ATOMICOPS_INL_H_

#include "uv.h"

#include "internal.h"

/* Atomic set operation on char */

#ifdef _MSC_VER /* MSVC */

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

 * efficient than InterlockedExchange, but InterlockedExchange8 does not exist,

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

 * aligned. */

#pragma intrinsic(_InterlockedOr8)

static char INLINE uv__atomic_exchange_set(char volatile* target) {

  return _InterlockedOr8(target, 1);

}

#else /* GCC */

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

static inline char uv__atomic_exchange_set(char volatile* target) {

  const char one = 1;

  char old_value;

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

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

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

                        : "memory");

  return old_value;

}

#endif

#endif /* UV_WIN_ATOMICOPS_INL_H_ */