Subversion Repositories Games.Chess Giants

/*

  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_H_INCLUDED

#define THREAD_H_INCLUDED

#include <atomic>

#include <bitset>

#include <condition_variable>

#include <mutex>

#include <thread>

#include <vector>

#include "material.h"

#include "movepick.h"

#include "pawns.h"

#include "position.h"

#include "search.h"

#include "thread_win32.h"

/// Thread struct keeps together all the thread-related stuff. We also use

/// per-thread pawn and material hash tables so that once we get a pointer to an

/// entry its life time is unlimited and we don't have to care about someone

/// changing the entry under our feet.

class Thread {

  std::thread nativeThread;

  Mutex mutex;

  ConditionVariable sleepCondition;

  bool exit, searching;

public:

  Thread();

  virtual ~Thread();

  virtual void search();

  void idle_loop();

  void start_searching(bool resume = false);

  void wait_for_search_finished();

  void wait(std::atomic_bool& b);

  Pawns::Table pawnsTable;

  Material::Table materialTable;

  Endgames endgames;

  size_t idx, PVIdx;

  int maxPly, callsCnt;

  uint64_t tbHits;

  Position rootPos;

  Search::RootMoves rootMoves;

  Depth rootDepth;

  Depth completedDepth;

  std::atomic_bool resetCalls;

  HistoryStats history;

  MoveStats counterMoves;

  FromToStats fromTo;

  CounterMoveHistoryStats counterMoveHistory;

};

/// MainThread is a derived class with a specific overload for the main thread

struct MainThread : public Thread {

  virtual void search();

  bool easyMovePlayed, failedLow;

  double bestMoveChanges;

  Value previousScore;

};

/// ThreadPool struct handles all the threads-related stuff like init, starting,

/// parking and, most importantly, launching a thread. All the access to threads

/// data is done through this class.

struct ThreadPool : public std::vector<Thread*> {

  void init(); // No constructor and destructor, threads rely on globals that should

  void exit(); // be initialized and valid during the whole thread lifetime.

  MainThread* main() { return static_cast<MainThread*>(at(0)); }

  void start_thinking(Position&, StateListPtr&, const Search::LimitsType&);

  void read_uci_options();

  uint64_t nodes_searched() const;

  uint64_t tb_hits() const;

private:

  StateListPtr setupStates;

};

extern ThreadPool Threads;

#endif // #ifndef THREAD_H_INCLUDED