/*
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) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#ifndef THREAD_WIN32_OSX_H_INCLUDED
#define THREAD_WIN32_OSX_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>
#include <thread>
-#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
-
/// On OSX threads other than the main thread are created with a reduced stack
-/// size of 512KB by default, this is dangerously low for deep searches, so
-/// adjust it to TH_STACK_SIZE. The implementation calls pthread_create() with
-/// proper stack size parameter.
-
-/// On toolchains where pthread is always available, ensure minimum stack size
-/// instead of relying on linker defaults which may be platform-specific.
+/// size of 512KB by default, this is too low for deep searches, which require
+/// somewhat more than 1MB stack, so adjust it to TH_STACK_SIZE.
+/// The implementation calls pthread_create() with the stack size parameter
+/// equal to the linux 8MB default, on platforms that support it.
-#if defined(__APPLE__) || defined(__MINGW32__) || defined(__MINGW64__)
+#if defined(__APPLE__) || defined(__MINGW32__) || defined(__MINGW64__) || defined(USE_PTHREADS)
#include <pthread.h>
+namespace Stockfish {
+
static const size_t TH_STACK_SIZE = 8 * 1024 * 1024;
template <class T, class P = std::pair<T*, void(T::*)()>>
void join() { pthread_join(thread, NULL); }
};
+} // namespace Stockfish
+
#else // Default case: use STL classes
+namespace Stockfish {
+
typedef std::thread NativeThread;
+} // namespace Stockfish
+
#endif
#endif // #ifndef THREAD_WIN32_OSX_H_INCLUDED