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
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #ifndef THREAD_H_INCLUDED
21 #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.
43 struct Thread : public std::thread {
47 virtual void search();
51 void wait(std::atomic_bool& b);
53 std::atomic_bool exit, searching, resetCalls;
55 ConditionVariable sleepCondition;
57 Pawns::Table pawnsTable;
58 Material::Table materialTable;
64 Search::RootMoveVector rootMoves;
67 MovesStats counterMoves;
72 /// MainThread is a derived classes used to characterize the the main one
74 struct MainThread : public Thread {
75 virtual void search();
79 /// ThreadPool struct handles all the threads related stuff like init, starting,
80 /// parking and, most importantly, launching a thread.
81 /// All the access to shared thread data is done through this class.
83 struct ThreadPool : public std::vector<Thread*> {
85 void init(); // No constructor and destructor, threads rely on globals that should
86 void exit(); // be initialized and valid during the whole thread lifetime.
88 MainThread* main() { return static_cast<MainThread*>(at(0)); }
89 void read_uci_options();
90 void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
91 int64_t nodes_searched();
94 extern ThreadPool Threads;
96 #endif // #ifndef THREAD_H_INCLUDED