/*
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) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
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 <atomic>
#include <condition_variable>
+#include <cstddef>
+#include <cstdint>
#include <mutex>
-#include <thread>
#include <vector>
-#include "material.h"
#include "movepick.h"
-#include "pawns.h"
#include "position.h"
#include "search.h"
-#include "thread_win32.h"
+#include "thread_win32_osx.h"
+#include "types.h"
+namespace Stockfish {
-/// 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.
-
+// Thread class keeps together all the thread-related stuff.
class Thread {
- Mutex mutex;
- ConditionVariable cv;
- size_t idx;
- bool exit = false, searching = true; // Set before starting std::thread
- std::thread stdThread;
-
-public:
- explicit Thread(size_t);
- virtual ~Thread();
- virtual void search();
- void clear();
- void idle_loop();
- void start_searching();
- void wait_for_search_finished();
-
- Pawns::Table pawnsTable;
- Material::Table materialTable;
- Endgames endgames;
- size_t pvIdx, pvLast;
- int selDepth, nmpMinPly;
- Color nmpColor;
- std::atomic<uint64_t> nodes, tbHits;
-
- Position rootPos;
- Search::RootMoves rootMoves;
- Depth rootDepth, completedDepth;
- CounterMoveHistory counterMoves;
- ButterflyHistory mainHistory;
- CapturePieceToHistory captureHistory;
- ContinuationHistory continuationHistory;
- Score contempt;
+ std::mutex mutex;
+ std::condition_variable cv;
+ size_t idx;
+ bool exit = false, searching = true; // Set before starting std::thread
+ NativeThread stdThread;
+
+ public:
+ explicit Thread(size_t);
+ virtual ~Thread();
+ virtual void search();
+ void clear();
+ void idle_loop();
+ void start_searching();
+ void wait_for_search_finished();
+ size_t id() const { return idx; }
+
+ size_t pvIdx, pvLast;
+ std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
+ int selDepth, nmpMinPly;
+ Value bestValue, optimism[COLOR_NB];
+
+ Position rootPos;
+ StateInfo rootState;
+ Search::RootMoves rootMoves;
+ Depth rootDepth, completedDepth;
+ Value rootDelta;
+ Value rootSimpleEval;
+ CounterMoveHistory counterMoves;
+ ButterflyHistory mainHistory;
+ CapturePieceToHistory captureHistory;
+ ContinuationHistory continuationHistory[2][2];
+ PawnHistory pawnHistory;
};
-/// MainThread is a derived class specific for main thread
-
-struct MainThread : public Thread {
+// MainThread is a derived class specific for main thread
+struct MainThread: public Thread {
- using Thread::Thread;
+ using Thread::Thread;
- void search() override;
- void check_time();
+ void search() override;
+ void check_time();
- double bestMoveChanges, previousTimeReduction;
- Value previousScore;
- int callsCnt;
+ double previousTimeReduction;
+ Value bestPreviousScore;
+ Value bestPreviousAverageScore;
+ 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
-/// is done through this class.
+// ThreadPool struct handles all the threads-related stuff like init, starting,
+// parking and, most importantly, launching a thread. All the access to threads
+// is done through this class.
+struct ThreadPool {
-struct ThreadPool : public std::vector<Thread*> {
+ void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
+ void clear();
+ void set(size_t);
- void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
- void clear();
- void set(size_t);
+ MainThread* main() const { return static_cast<MainThread*>(threads.front()); }
+ uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
+ uint64_t tb_hits() const { return accumulate(&Thread::tbHits); }
+ Thread* get_best_thread() const;
+ void start_searching();
+ void wait_for_search_finished() 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;
- std::atomic_bool stop, ponder, stopOnPonderhit;
+ auto cbegin() const noexcept { return threads.cbegin(); }
+ auto begin() noexcept { return threads.begin(); }
+ auto end() noexcept { return threads.end(); }
+ auto cend() const noexcept { return threads.cend(); }
+ auto size() const noexcept { return threads.size(); }
+ auto empty() const noexcept { return threads.empty(); }
-private:
- StateListPtr setupStates;
+ private:
+ StateListPtr setupStates;
+ std::vector<Thread*> threads;
- uint64_t accumulate(std::atomic<uint64_t> Thread::* member) const {
+ 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;
- }
+ uint64_t sum = 0;
+ for (Thread* th : threads)
+ sum += (th->*member).load(std::memory_order_relaxed);
+ return sum;
+ }
};
extern ThreadPool Threads;
-#endif // #ifndef THREAD_H_INCLUDED
+} // namespace Stockfish
+
+#endif // #ifndef THREAD_H_INCLUDED
projects / stockfish / blobdiff