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133 lines
4.0 KiB
C++
133 lines
4.0 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(THREAD_H_INCLUDED)
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#define THREAD_H_INCLUDED
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#include <cstring>
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#include "lock.h"
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#include "material.h"
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#include "movepick.h"
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#include "pawns.h"
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#include "position.h"
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const int MAX_THREADS = 32;
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const int MAX_ACTIVE_SPLIT_POINTS = 8;
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struct SplitPoint {
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// Const data after splitPoint has been setup
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SplitPoint* parent;
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const Position* pos;
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Depth depth;
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bool pvNode;
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Value beta;
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int ply;
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int master;
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Move threatMove;
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// Const pointers to shared data
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MovePicker* mp;
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SearchStack* ss;
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// Shared data
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Lock lock;
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volatile int64_t nodes;
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volatile Value alpha;
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volatile Value bestValue;
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volatile int moveCount;
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volatile bool is_betaCutoff;
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volatile bool is_slave[MAX_THREADS];
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};
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/// Thread struct is used to keep together all the thread related stuff like locks,
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/// state and especially split points. We also use per-thread pawn and material hash
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/// tables so that once we get a pointer to an entry its life time is unlimited and
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/// we don't have to care about someone changing the entry under our feet.
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struct Thread {
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enum ThreadState
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{
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INITIALIZING, // Thread is initializing itself
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SEARCHING, // Thread is performing work
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AVAILABLE, // Thread is waiting for work
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BOOKED, // Other thread (master) has booked us as a slave
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WORKISWAITING, // Master has ordered us to start
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TERMINATED // We are quitting and thread is terminated
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};
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void wake_up();
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bool cutoff_occurred() const;
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bool is_available_to(int master) const;
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MaterialInfoTable materialTable;
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PawnInfoTable pawnTable;
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int maxPly;
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Lock sleepLock;
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WaitCondition sleepCond;
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volatile ThreadState state;
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SplitPoint* volatile splitPoint;
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volatile int activeSplitPoints;
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SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
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};
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/// ThreadsManager class is used to handle all the threads related stuff like init,
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/// starting, parking and, the most important, launching a slave thread at a split
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/// point. All the access to shared thread data is done through this class.
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class ThreadsManager {
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/* As long as the single ThreadsManager object is defined as a global we don't
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need to explicitly initialize to zero its data members because variables with
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static storage duration are automatically set to zero before enter main()
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*/
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public:
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Thread& operator[](int threadID) { return threads[threadID]; }
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void init();
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void exit();
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void init_hash_tables();
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int min_split_depth() const { return minimumSplitDepth; }
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int size() const { return activeThreads; }
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void set_size(int cnt) { activeThreads = cnt; }
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void read_uci_options();
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bool available_slave_exists(int master) const;
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void idle_loop(int threadID, SplitPoint* sp);
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template <bool Fake>
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void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
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Depth depth, Move threatMove, int moveCount, MovePicker* mp, bool pvNode);
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private:
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Lock mpLock;
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Depth minimumSplitDepth;
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int maxThreadsPerSplitPoint;
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bool useSleepingThreads;
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int activeThreads;
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volatile bool allThreadsShouldExit;
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Thread threads[MAX_THREADS];
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};
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extern ThreadsManager Threads;
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#endif // !defined(THREAD_H_INCLUDED)
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