|
160
|
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_ */
|
