71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/*
|
|
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
|
|
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
|
|
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
|
|
Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
|
|
|
|
Stockfish is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Stockfish is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef THREAD_WIN32_H_INCLUDED
|
|
#define THREAD_WIN32_H_INCLUDED
|
|
|
|
/// STL thread library used by mingw and gcc when cross compiling for Windows
|
|
/// relies on libwinpthread. Currently libwinpthread implements mutexes directly
|
|
/// on top of Windows semaphores. Semaphores, being kernel objects, require kernel
|
|
/// mode transition in order to lock or unlock, which is very slow compared to
|
|
/// interlocked operations (about 30% slower on bench test). To work around this
|
|
/// issue, we define our wrappers to the low level Win32 calls. We use critical
|
|
/// sections to support Windows XP and older versions. Unfortunately, cond_wait()
|
|
/// is racy between unlock() and WaitForSingleObject() but they have the same
|
|
/// speed performance as the SRW locks.
|
|
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
|
|
#if defined(_WIN32) && !defined(_MSC_VER)
|
|
|
|
#ifndef NOMINMAX
|
|
# define NOMINMAX // Disable macros min() and max()
|
|
#endif
|
|
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include <windows.h>
|
|
#undef WIN32_LEAN_AND_MEAN
|
|
#undef NOMINMAX
|
|
|
|
/// Mutex and ConditionVariable struct are wrappers of the low level locking
|
|
/// machinery and are modeled after the corresponding C++11 classes.
|
|
|
|
struct Mutex {
|
|
Mutex() { InitializeCriticalSection(&cs); }
|
|
~Mutex() { DeleteCriticalSection(&cs); }
|
|
void lock() { EnterCriticalSection(&cs); }
|
|
void unlock() { LeaveCriticalSection(&cs); }
|
|
|
|
private:
|
|
CRITICAL_SECTION cs;
|
|
};
|
|
|
|
typedef std::condition_variable_any ConditionVariable;
|
|
|
|
#else // Default case: use STL classes
|
|
|
|
typedef std::mutex Mutex;
|
|
typedef std::condition_variable ConditionVariable;
|
|
|
|
#endif
|
|
|
|
#endif // #ifndef THREAD_WIN32_H_INCLUDED
|