X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=src%2Fthread.h;h=e71db835734d7bd2bc146b0cf71332e0d9b6ca61;hb=8d16111ffde1689d48d47ec379ba91613213183c;hp=d0c1d8e9519edd6d7966f86cbdd9da6f4b5415d2;hpb=5ca428402793b07b432b006056a1368f359c4ea0;p=stockfish
diff --git a/src/thread.h b/src/thread.h
index d0c1d8e9..606f9626 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -1,7 +1,7 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -17,64 +17,142 @@
along with this program. If not, see .
*/
-
-#if !defined(THREAD_H_INCLUDED)
+#ifndef THREAD_H_INCLUDED
#define THREAD_H_INCLUDED
+#include
+#include
+#include
+#include
+#include
-////
-//// Includes
-////
-
-#include "lock.h"
+#include "material.h"
#include "movepick.h"
+#include "pawns.h"
#include "position.h"
#include "search.h"
+struct Thread;
-////
-//// Constants and variables
-////
-
-const int THREAD_MAX = 8;
-const int ACTIVE_SPLIT_POINTS_MAX = 8;
-
+const size_t MAX_THREADS = 128;
+const size_t MAX_SPLITPOINTS_PER_THREAD = 8;
+const size_t MAX_SLAVES_PER_SPLITPOINT = 4;
-////
-//// Types
-////
+/// SplitPoint struct stores information shared by the threads searching in
+/// parallel below the same split point. It is populated at splitting time.
struct SplitPoint {
- SplitPoint *parent;
+
+ // Const data after split point has been setup
const Position* pos;
- SearchStack sstack[THREAD_MAX][PLY_MAX_PLUS_2];
- SearchStack *parentSstack;
- int ply;
+ Search::Stack* ss;
+ Thread* master;
Depth depth;
- volatile Value alpha, beta, bestValue, futilityValue;
- bool pvNode;
- int master, slaves[THREAD_MAX];
- Lock lock;
- MovePicker *mp;
- volatile int moves;
- volatile int cpus;
- bool finished;
+ Value beta;
+ int nodeType;
+ bool cutNode;
+
+ // Const pointers to shared data
+ MovePicker* movePicker;
+ SplitPoint* parentSplitPoint;
+
+ // Shared variable data
+ std::mutex mutex;
+ std::bitset slavesMask;
+ volatile bool allSlavesSearching;
+ volatile uint64_t nodes;
+ volatile Value alpha;
+ volatile Value bestValue;
+ volatile Move bestMove;
+ volatile int moveCount;
+ volatile bool cutoff;
+};
+
+
+/// ThreadBase struct is the base of the hierarchy from where we derive all the
+/// specialized thread classes.
+
+struct ThreadBase {
+
+ virtual ~ThreadBase() = default;
+ virtual void idle_loop() = 0;
+ void notify_one();
+ void wait_for(volatile const bool& b);
+
+ std::thread nativeThread;
+ std::mutex mutex;
+ std::condition_variable sleepCondition;
+ volatile bool exit = false;
};
-struct Thread {
- SplitPoint *splitPoint;
- volatile int activeSplitPoints;
- uint64_t nodes;
- uint64_t betaCutOffs[2];
- bool failHighPly1;
- volatile bool stop;
- volatile bool running;
- volatile bool idle;
- volatile bool workIsWaiting;
- volatile bool printCurrentLine;
- unsigned char pad[64]; // set some distance among local data for each thread
+/// Thread struct keeps together all the thread related stuff like locks, state
+/// and especially split points. We also use per-thread pawn and material hash
+/// tables so that once we get a pointer to an entry its life time is unlimited
+/// and we don't have to care about someone changing the entry under our feet.
+
+struct Thread : public ThreadBase {
+
+ Thread();
+ virtual void idle_loop();
+ bool cutoff_occurred() const;
+ bool available_to(const Thread* master) const;
+
+ void split(Position& pos, Search::Stack* ss, Value alpha, Value beta, Value* bestValue, Move* bestMove,
+ Depth depth, int moveCount, MovePicker* movePicker, int nodeType, bool cutNode);
+
+ SplitPoint splitPoints[MAX_SPLITPOINTS_PER_THREAD];
+ Pawns::Table pawnsTable;
+ Material::Table materialTable;
+ Endgames endgames;
+ Position* activePosition;
+ size_t idx;
+ int maxPly;
+ SplitPoint* volatile activeSplitPoint;
+ volatile size_t splitPointsSize;
+ volatile bool searching;
+};
+
+
+/// MainThread and TimerThread are derived classes used to characterize the two
+/// special threads: the main one and the recurring timer.
+
+struct MainThread : public Thread {
+ virtual void idle_loop();
+ volatile bool thinking = true; // Avoid a race with start_thinking()
+};
+
+struct TimerThread : public ThreadBase {
+
+ static const int Resolution = 5; // Millisec between two check_time() calls
+
+ virtual void idle_loop();
+
+ bool run = false;
+};
+
+
+/// ThreadPool struct handles all the threads related stuff like init, starting,
+/// parking and, most importantly, launching a slave thread at a split point.
+/// All the access to shared thread data is done through this class.
+
+struct ThreadPool : public std::vector {
+
+ void init(); // No c'tor and d'tor, threads rely on globals that should be
+ void exit(); // initialized and are valid during the whole thread lifetime.
+
+ MainThread* main() { return static_cast(at(0)); }
+ void read_uci_options();
+ Thread* available_slave(const Thread* master) const;
+ void wait_for_think_finished();
+ void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
+
+ Depth minimumSplitDepth;
+ std::mutex mutex;
+ std::condition_variable sleepCondition;
+ TimerThread* timer;
};
+extern ThreadPool Threads;
-#endif // !defined(THREAD_H_INCLUDED)
+#endif // #ifndef THREAD_H_INCLUDED