X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fthread.h;h=d6a48eca73d14937f19212d462d9a120398d21d0;hb=HEAD;hp=56d000f3f94438275a83c88eb06ad7c2582fd921;hpb=e005270fb6fb5a21ccfa91186181707882aef285;p=stockfish diff --git a/src/thread.h b/src/thread.h index 56d000f3..cb2f6db1 100644 --- a/src/thread.h +++ b/src/thread.h @@ -1,7 +1,6 @@ /* Stockfish, a UCI chess playing engine derived from Glaurung 2.1 - Copyright (C) 2004-2008 Tord Romstad (Glaurung author) - Copyright (C) 2008-2013 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 @@ -20,159 +19,117 @@ #ifndef THREAD_H_INCLUDED #define THREAD_H_INCLUDED +#include +#include +#include +#include +#include #include -#include "material.h" #include "movepick.h" -#include "pawns.h" #include "position.h" #include "search.h" - -const int MAX_THREADS = 64; // Because SplitPoint::slavesMask is a uint64_t -const int MAX_SPLITPOINTS_PER_THREAD = 8; - -struct Mutex { - Mutex() { lock_init(l); } - ~Mutex() { lock_destroy(l); } - - void lock() { lock_grab(l); } - void unlock() { lock_release(l); } - -private: - friend struct ConditionVariable; - - Lock l; -}; - -struct ConditionVariable { - ConditionVariable() { cond_init(c); } - ~ConditionVariable() { cond_destroy(c); } - - void wait(Mutex& m) { cond_wait(c, m.l); } - void wait_for(Mutex& m, int ms) { timed_wait(c, m.l, ms); } - void notify_one() { cond_signal(c); } - -private: - WaitCondition c; -}; - -struct Thread; - -struct SplitPoint { - - // Const data after split point has been setup - const Position* pos; - const Search::Stack* ss; - Thread* masterThread; - Depth depth; - Value beta; - int nodeType; - Move threatMove; - bool cutNode; - - // Const pointers to shared data - MovePicker* movePicker; - SplitPoint* parentSplitPoint; - - // Shared data - Mutex mutex; - volatile uint64_t slavesMask; - volatile int64_t nodes; - volatile Value alpha; - volatile Value bestValue; - volatile Move bestMove; - volatile int moveCount; - volatile bool cutoff; +#include "thread_win32_osx.h" +#include "types.h" + +namespace Stockfish { + +// Thread class keeps together all the thread-related stuff. +class Thread { + + 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 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; }; -/// ThreadBase struct is the base of the hierarchy from where we derive all the -/// specialized thread classes. +// MainThread is a derived class specific for main thread +struct MainThread: public Thread { -struct ThreadBase { + using Thread::Thread; - ThreadBase() : exit(false) {} - virtual ~ThreadBase() {} - virtual void idle_loop() = 0; - void notify_one(); - void wait_for(volatile const bool& b); + void search() override; + void check_time(); - Mutex mutex; - ConditionVariable sleepCondition; - NativeHandle handle; - volatile bool exit; + double previousTimeReduction; + Value bestPreviousScore; + Value bestPreviousAverageScore; + Value iterValue[4]; + int callsCnt; + bool stopOnPonderhit; + std::atomic_bool ponder; }; -/// 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 is_available_to(const Thread* master) const; - - template - void split(Position& pos, const Search::Stack* ss, Value alpha, Value beta, Value* bestValue, Move* bestMove, - Depth depth, Move threatMove, int moveCount, MovePicker* movePicker, int nodeType, bool cutNode); - - SplitPoint splitPoints[MAX_SPLITPOINTS_PER_THREAD]; - Material::Table materialTable; - Endgames endgames; - Pawns::Table pawnsTable; - Position* activePosition; - size_t idx; - int maxPly; - SplitPoint* volatile activeSplitPoint; - volatile int splitPointsSize; - volatile bool searching; -}; +// 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 { + void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false); + void clear(); + void set(size_t); -/// MainThread and TimerThread are derived classes used to characterize the two -/// special threads: the main one and the recurring timer. + MainThread* main() const { return static_cast(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; -struct MainThread : public Thread { - MainThread() : thinking(true) {} // Avoid a race with start_thinking() - virtual void idle_loop(); - volatile bool thinking; -}; + std::atomic_bool stop, increaseDepth; -struct TimerThread : public ThreadBase { - TimerThread() : msec(0) {} - virtual void idle_loop(); - int msec; -}; + 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 threads; -/// ThreadPool struct handles all the threads related stuff like init, starting, -/// parking and, the most important, launching a slave thread at a split point. -/// All the access to shared thread data is done through this class. + uint64_t accumulate(std::atomic Thread::*member) const { -struct ThreadPool : public std::vector { - - void init(); // No c'tor and d'tor, threads rely on globals that should - void exit(); // be initialized and valid during the whole thread lifetime. - - MainThread* main() { return static_cast((*this)[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&, - const std::vector&, Search::StateStackPtr&); - - bool sleepWhileIdle; - Depth minimumSplitDepth; - size_t maxThreadsPerSplitPoint; - Mutex mutex; - ConditionVariable sleepCondition; - TimerThread* timer; + 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