Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, 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
#include "pawns.h"
#include "position.h"
#include "search.h"
-#include "thread_win32.h"
+#include "thread_win32_osx.h"
-/// Thread struct keeps together all the thread-related stuff. 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.
+/// Thread class keeps together all the thread-related stuff. We 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.
class Thread {
- std::thread nativeThread;
- Mutex mutex;
- ConditionVariable sleepCondition;
- bool exit, searching;
+ std::mutex mutex;
+ std::condition_variable cv;
+ size_t idx;
+ bool exit = false, searching = true; // Set before starting std::thread
+ NativeThread stdThread;
public:
- Thread();
+ explicit Thread(size_t);
virtual ~Thread();
virtual void search();
+ void clear();
void idle_loop();
- void start_searching(bool resume = false);
+ void start_searching();
void wait_for_search_finished();
- void wait(std::atomic_bool& condition);
+ int best_move_count(Move move) const;
Pawns::Table pawnsTable;
Material::Table materialTable;
- Endgames endgames;
- size_t idx, PVIdx;
- int maxPly;
- std::atomic<uint64_t> nodes, tbHits;
+ size_t pvIdx, pvLast;
+ uint64_t ttHitAverage;
+ int selDepth, nmpMinPly;
+ Color nmpColor;
+ std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
Position rootPos;
Search::RootMoves rootMoves;
- std::atomic<Depth> rootDepth;
- Depth completedDepth;
- CounterMoveStat counterMoves;
- ButterflyHistory history;
- CounterMoveHistoryStat counterMoveHistory;
+ Depth rootDepth, completedDepth;
+ CounterMoveHistory counterMoves;
+ ButterflyHistory mainHistory;
+ LowPlyHistory lowPlyHistory;
+ CapturePieceToHistory captureHistory;
+ ContinuationHistory continuationHistory[2][2];
+ Score contempt;
};
-/// MainThread is a derived class with a specific overload for the main thread
+/// MainThread is a derived class specific for main thread
struct MainThread : public Thread {
- virtual void search();
+
+ using Thread::Thread;
+
+ void search() override;
void check_time();
- bool easyMovePlayed, failedLow;
- double bestMoveChanges;
- Value previousScore;
- int callsCnt = 0;
+ double previousTimeReduction;
+ Value bestPreviousScore;
+ Value iterValue[4];
+ int callsCnt;
+ bool stopOnPonderhit;
+ std::atomic_bool ponder;
};
/// ThreadPool struct handles all the threads-related stuff like init, starting,
/// parking and, most importantly, launching a thread. All the access to threads
-/// data is done through this class.
+/// is done through this class.
struct ThreadPool : public std::vector<Thread*> {
- void init(); // No constructor and destructor, threads rely on globals that should
- void exit(); // be initialized and valid during the whole thread lifetime.
+ void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
+ void clear();
+ void set(size_t);
- MainThread* main() { return static_cast<MainThread*>(at(0)); }
- void start_thinking(Position&, StateListPtr&, const Search::LimitsType&);
- void read_uci_options();
- uint64_t nodes_searched() const;
- uint64_t tb_hits() const;
+ MainThread* main() const { return static_cast<MainThread*>(front()); }
+ uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
+ uint64_t tb_hits() const { return accumulate(&Thread::tbHits); }
+
+ std::atomic_bool stop, increaseDepth;
private:
StateListPtr setupStates;
+
+ uint64_t accumulate(std::atomic<uint64_t> Thread::* member) const {
+
+ uint64_t sum = 0;
+ for (Thread* th : *this)
+ sum += (th->*member).load(std::memory_order_relaxed);
+ return sum;
+ }
};
extern ThreadPool Threads;