forked from cory/tildefriends
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
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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 */
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/* Mingw-32 version, hopefully this works for 64-bit gcc as well. */
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static inline char uv__atomic_exchange_set(char volatile* target) {
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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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}
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#endif
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#endif /* UV_WIN_ATOMICOPS_INL_H_ */
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