1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to 5 * deal in the Software without restriction, including without limitation the 6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 7 * sell copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 19 * IN THE SOFTWARE. 20 */ 21 22 #ifndef UV_WIN_ATOMICOPS_INL_H_ 23 #define UV_WIN_ATOMICOPS_INL_H_ 24 25 #include "uv.h" 26 #include "internal.h" 27 28 29 /* Atomic set operation on char */ 30 #ifdef _MSC_VER /* MSVC */ 31 32 /* _InterlockedOr8 is supported by MSVC on x32 and x64. It is slightly less 33 * efficient than InterlockedExchange, but InterlockedExchange8 does not exist, 34 * and interlocked operations on larger targets might require the target to be 35 * aligned. */ 36 #pragma intrinsic(_InterlockedOr8) 37 38 static char INLINE uv__atomic_exchange_set(char volatile* target) { 39 return _InterlockedOr8(target, 1); 40 } 41 42 #else /* GCC, Clang in mingw mode */ 43 44 static inline char uv__atomic_exchange_set(char volatile* target) { 45 #if defined(__i386__) || defined(__x86_64__) 46 /* Mingw-32 version, hopefully this works for 64-bit gcc as well. */ 47 const char one = 1; 48 char old_value; 49 __asm__ __volatile__ ("lock xchgb %0, %1\n\t" 50 : "=r"(old_value), "=m"(*target) 51 : "0"(one), "m"(*target) 52 : "memory"); 53 return old_value; 54 #else 55 return __sync_fetch_and_or(target, 1); 56 #endif 57 } 58 59 #endif 60 61 #endif /* UV_WIN_ATOMICOPS_INL_H_ */ 62