| /* 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" |
| |
| |
| /* 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 __declspec(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_ */ |