File: thread_win32_osx.h

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/*
  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
  Copyright (C) 2004-2020 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
  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_OSX_H_INCLUDED
#define THREAD_WIN32_OSX_H_INCLUDED

#include <thread>

/// On OSX threads other than the main thread are created with a reduced stack
/// 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__) || defined(USE_PTHREADS)

#include <pthread.h>

static const size_t TH_STACK_SIZE = 8 * 1024 * 1024;

template <class T, class P = std::pair<T*, void(T::*)()>>
void* start_routine(void* ptr)
{
   P* p = reinterpret_cast<P*>(ptr);
   (p->first->*(p->second))(); // Call member function pointer
   delete p;
   return NULL;
}

class NativeThread {

   pthread_t thread;

public:
  template<class T, class P = std::pair<T*, void(T::*)()>>
  explicit NativeThread(void(T::*fun)(), T* obj) {
    pthread_attr_t attr_storage, *attr = &attr_storage;
    pthread_attr_init(attr);
    pthread_attr_setstacksize(attr, TH_STACK_SIZE);
    pthread_create(&thread, attr, start_routine<T>, new P(obj, fun));
  }
  void join() { pthread_join(thread, NULL); }
};

#else // Default case: use STL classes

typedef std::thread NativeThread;

#endif

#endif // #ifndef THREAD_WIN32_OSX_H_INCLUDED