mirror of
https://github.com/opelly27/Stockfish.git
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Marco Costalba
2da290d72b
This is a per split-point request, not per-thread. When we find a beta cut-off in current thread's split point or in or in some ancestor of the current split point then threads should stop immediately the search and return to idle_loop(). The check is done by thread_should_stop() that now looks only at split point's chain. No functional change and a good semplification. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
91 lines
2.2 KiB
C
91 lines
2.2 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) 2008-2009 Marco Costalba
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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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////
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//// Includes
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////
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#include <cstring>
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#include "lock.h"
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#include "movepick.h"
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#include "position.h"
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#include "search.h"
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////
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//// Constants and variables
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////
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const int MAX_THREADS = 8;
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const int ACTIVE_SPLIT_POINTS_MAX = 8;
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////
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//// Types
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////
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struct SplitPoint {
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SplitPoint *parent;
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const Position* pos;
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SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
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SearchStack *parentSstack;
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int ply;
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Depth depth;
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volatile Value alpha, beta, bestValue;
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Value futilityValue;
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bool pvNode;
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int master, slaves[MAX_THREADS];
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Lock lock;
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MovePicker *mp;
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volatile int moves;
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volatile int cpus;
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volatile bool stopRequest;
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};
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// ThreadState type is used to represent thread's current state
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enum ThreadState
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{
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THREAD_SEARCHING, // thread is performing work
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THREAD_AVAILABLE, // thread is polling for work
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THREAD_SLEEPING, // we are not thinking, so thread is sleeping
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THREAD_BOOKED, // other thread (master) has booked us as a slave
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THREAD_WORKISWAITING, // master has ordered us to start
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THREAD_TERMINATED // we are quitting and thread is terminated
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};
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struct Thread {
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SplitPoint *splitPoint;
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volatile int activeSplitPoints;
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uint64_t nodes;
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uint64_t betaCutOffs[2];
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volatile bool printCurrentLineRequest;
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volatile ThreadState state;
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unsigned char pad[64]; // set some distance among local data for each thread
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};
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#endif // !defined(THREAD_H_INCLUDED)
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