/*
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) 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
#define THREAD_H_INCLUDED
#include <atomic>
-#include <bitset>
#include <condition_variable>
#include <mutex>
#include <thread>
#include "pawns.h"
#include "position.h"
#include "search.h"
-#include "thread_win32.h"
+#include "thread_win32_osx.h"
+namespace Stockfish {
-/// 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& b);
+ size_t id() const { return idx; }
Pawns::Table pawnsTable;
Material::Table materialTable;
- Endgames endgames;
- size_t idx, PVIdx;
- int maxPly, callsCnt;
+ size_t pvIdx, pvLast;
+ RunningAverage complexityAverage;
+ std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
+ int selDepth, nmpMinPly;
+ Color nmpColor;
+ Value bestValue, optimism[COLOR_NB];
Position rootPos;
- Search::RootMoveVector rootMoves;
- Depth rootDepth;
- HistoryStats history;
- MovesStats counterMoves;
- Depth completedDepth;
- std::atomic_bool resetCalls;
+ StateInfo rootState;
+ Search::RootMoves rootMoves;
+ Depth rootDepth, completedDepth;
+ Value rootDelta;
+ CounterMoveHistory counterMoves;
+ ButterflyHistory mainHistory;
+ CapturePieceToHistory captureHistory;
+ ContinuationHistory continuationHistory[2][2];
};
-/// 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();
- bool easyMovePlayed, failedLow;
- double bestMoveChanges;
+ using Thread::Thread;
+
+ void search() override;
+ void check_time();
+
+ 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,
+/// 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 {
+
+ void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
+ void clear();
+ void set(size_t);
-struct ThreadPool : public std::vector<Thread*> {
+ 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;
- void init(); // No constructor and destructor, threads rely on globals that should
- void exit(); // be initialized and valid during the whole thread lifetime.
+ std::atomic_bool stop, increaseDepth;
- MainThread* main() { return static_cast<MainThread*>(at(0)); }
- void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
- void read_uci_options();
- int64_t nodes_searched();
+ 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;
+ std::vector<Thread*> threads;
+
+ uint64_t accumulate(std::atomic<uint64_t> Thread::* member) const {
+
+ uint64_t sum = 0;
+ for (Thread* th : threads)
+ sum += (th->*member).load(std::memory_order_relaxed);
+ return sum;
+ }
};
extern ThreadPool Threads;
+} // namespace Stockfish
+
#endif // #ifndef THREAD_H_INCLUDED