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) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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.
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.
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/>.
21 #ifndef THREAD_H_INCLUDED
22 #define THREAD_H_INCLUDED
25 #include <condition_variable>
35 #include "thread_win32.h"
38 /// Thread struct keeps together all the thread-related stuff. We also use
39 /// per-thread pawn and material hash tables so that once we get a pointer to an
40 /// entry its life time is unlimited and we don't have to care about someone
41 /// changing the entry under our feet.
45 std::thread nativeThread;
47 ConditionVariable sleepCondition;
53 virtual void search();
55 void start_searching(bool resume = false);
56 void wait_for_search_finished();
57 void wait(std::atomic_bool& condition);
59 Pawns::Table pawnsTable;
60 Material::Table materialTable;
67 Search::RootMoves rootMoves;
70 std::atomic_bool resetCalls;
71 CounterMoveStat counterMoves;
72 ButterflyHistory history;
73 CounterMoveHistoryStat counterMoveHistory;
77 /// MainThread is a derived class with a specific overload for the main thread
79 struct MainThread : public Thread {
80 virtual void search();
82 bool easyMovePlayed, failedLow;
83 double bestMoveChanges;
88 /// ThreadPool struct handles all the threads-related stuff like init, starting,
89 /// parking and, most importantly, launching a thread. All the access to threads
90 /// data is done through this class.
92 struct ThreadPool : public std::vector<Thread*> {
94 void init(); // No constructor and destructor, threads rely on globals that should
95 void exit(); // be initialized and valid during the whole thread lifetime.
97 MainThread* main() { return static_cast<MainThread*>(at(0)); }
98 void start_thinking(Position&, StateListPtr&, const Search::LimitsType&);
99 void read_uci_options();
100 uint64_t nodes_searched() const;
101 uint64_t tb_hits() const;
104 StateListPtr setupStates;
107 extern ThreadPool Threads;
109 #endif // #ifndef THREAD_H_INCLUDED