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  1. /*
  2.   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
  3.   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
  4.   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
  5.   Copyright (C) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
  6.  
  7.   Stockfish is free software: you can redistribute it and/or modify
  8.   it under the terms of the GNU General Public License as published by
  9.   the Free Software Foundation, either version 3 of the License, or
  10.   (at your option) any later version.
  11.  
  12.   Stockfish is distributed in the hope that it will be useful,
  13.   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.   GNU General Public License for more details.
  16.  
  17.   You should have received a copy of the GNU General Public License
  18.   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19. */
  20.  
  21. #ifndef THREAD_H_INCLUDED
  22. #define THREAD_H_INCLUDED
  23.  
  24. #include <atomic>
  25. #include <bitset>
  26. #include <condition_variable>
  27. #include <mutex>
  28. #include <thread>
  29. #include <vector>
  30.  
  31. #include "material.h"
  32. #include "movepick.h"
  33. #include "pawns.h"
  34. #include "position.h"
  35. #include "search.h"
  36. #include "thread_win32.h"
  37.  
  38.  
  39. /// Thread struct keeps together all the thread-related stuff. We also use
  40. /// per-thread pawn and material hash tables so that once we get a pointer to an
  41. /// entry its life time is unlimited and we don't have to care about someone
  42. /// changing the entry under our feet.
  43.  
  44. class Thread {
  45.  
  46.   std::thread nativeThread;
  47.   Mutex mutex;
  48.   ConditionVariable sleepCondition;
  49.   bool exit, searching;
  50.  
  51. public:
  52.   Thread();
  53.   virtual ~Thread();
  54.   virtual void search();
  55.   void idle_loop();
  56.   void start_searching(bool resume = false);
  57.   void wait_for_search_finished();
  58.   void wait(std::atomic_bool& b);
  59.  
  60.   Pawns::Table pawnsTable;
  61.   Material::Table materialTable;
  62.   Endgames endgames;
  63.   size_t idx, PVIdx;
  64.   int maxPly, callsCnt;
  65.  
  66.   Position rootPos;
  67.   Search::RootMoveVector rootMoves;
  68.   Depth rootDepth;
  69.   HistoryStats history;
  70.   MoveStats counterMoves;
  71.   Depth completedDepth;
  72.   std::atomic_bool resetCalls;
  73. };
  74.  
  75.  
  76. /// MainThread is a derived class with a specific overload for the main thread
  77.  
  78. struct MainThread : public Thread {
  79.   virtual void search();
  80.  
  81.   bool easyMovePlayed, failedLow;
  82.   double bestMoveChanges;
  83.   Value previousScore;
  84. };
  85.  
  86.  
  87. /// ThreadPool struct handles all the threads-related stuff like init, starting,
  88. /// parking and, most importantly, launching a thread. All the access to threads
  89. /// data is done through this class.
  90.  
  91. struct ThreadPool : public std::vector<Thread*> {
  92.  
  93.   void init(); // No constructor and destructor, threads rely on globals that should
  94.   void exit(); // be initialized and valid during the whole thread lifetime.
  95.  
  96.   MainThread* main() { return static_cast<MainThread*>(at(0)); }
  97.   void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
  98.   void read_uci_options();
  99.   int64_t nodes_searched();
  100. };
  101.  
  102. extern ThreadPool Threads;
  103.  
  104. #endif // #ifndef THREAD_H_INCLUDED
  105.