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| Rev | Author | Line No. | Line |
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| 96 | pmbaty | 1 | /* |
| 2 | Stockfish, a UCI chess playing engine derived from Glaurung 2.1 |
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| 3 | Copyright (C) 2004-2008 Tord Romstad (Glaurung author) |
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| 4 | Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad |
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| 185 | pmbaty | 5 | Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad |
| 96 | pmbaty | 6 | |
| 7 | Stockfish is free software: you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation, either version 3 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |||
| 12 | Stockfish is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |||
| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef THREAD_WIN32_H_INCLUDED |
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| 22 | #define THREAD_WIN32_H_INCLUDED |
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| 23 | |||
| 24 | /// STL thread library used by mingw and gcc when cross compiling for Windows |
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| 25 | /// relies on libwinpthread. Currently libwinpthread implements mutexes directly |
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| 26 | /// on top of Windows semaphores. Semaphores, being kernel objects, require kernel |
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| 27 | /// mode transition in order to lock or unlock, which is very slow compared to |
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| 28 | /// interlocked operations (about 30% slower on bench test). To work around this |
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| 29 | /// issue, we define our wrappers to the low level Win32 calls. We use critical |
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| 30 | /// sections to support Windows XP and older versions. Unfortunately, cond_wait() |
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| 31 | /// is racy between unlock() and WaitForSingleObject() but they have the same |
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| 32 | /// speed performance as the SRW locks. |
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| 33 | |||
| 34 | #include <condition_variable> |
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| 35 | #include <mutex> |
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| 36 | |||
| 37 | #if defined(_WIN32) && !defined(_MSC_VER) |
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| 38 | |||
| 39 | #ifndef NOMINMAX |
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| 40 | # define NOMINMAX // Disable macros min() and max() |
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| 41 | #endif |
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| 42 | |||
| 43 | #define WIN32_LEAN_AND_MEAN |
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| 44 | #include <windows.h> |
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| 45 | #undef WIN32_LEAN_AND_MEAN |
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| 46 | #undef NOMINMAX |
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| 47 | |||
| 48 | /// Mutex and ConditionVariable struct are wrappers of the low level locking |
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| 49 | /// machinery and are modeled after the corresponding C++11 classes. |
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| 50 | |||
| 51 | struct Mutex { |
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| 52 | Mutex() { InitializeCriticalSection(&cs); } |
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| 53 | ~Mutex() { DeleteCriticalSection(&cs); } |
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| 54 | void lock() { EnterCriticalSection(&cs); } |
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| 55 | void unlock() { LeaveCriticalSection(&cs); } |
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| 56 | |||
| 57 | private: |
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| 58 | CRITICAL_SECTION cs; |
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| 59 | }; |
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| 60 | |||
| 61 | typedef std::condition_variable_any ConditionVariable; |
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| 62 | |||
| 63 | #else // Default case: use STL classes |
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| 64 | |||
| 65 | typedef std::mutex Mutex; |
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| 66 | typedef std::condition_variable ConditionVariable; |
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| 67 | |||
| 68 | #endif |
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| 69 | |||
| 70 | #endif // #ifndef THREAD_WIN32_H_INCLUDED |