mirror of
https://github.com/opelly27/Stockfish.git
synced 2026-05-20 15:37:47 +00:00
Joost VandeVondele
e8472b5fbe
RootInTB was an incorrectly shared global, probably leading to wrong scoreing Minor: setting TB global state from input by all threads (all threads write same values) setting Limits global state by all threads (idem) thread counting for finalization CI can be enabled once races are fixed in the learner, manually goes like: ``` make clean && make -j2 ARCH=x86-64-modern sanitize=thread optimize=no debug=yes build ../tests/instrumented_learn.sh --sanitizer-thread ``` Needs some review.
133 lines
3.6 KiB
C++
133 lines
3.6 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef THREAD_H_INCLUDED
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#define THREAD_H_INCLUDED
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#include <atomic>
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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#include <vector>
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#include "material.h"
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#include "movepick.h"
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#include "pawns.h"
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#include "position.h"
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#include "search.h"
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#include "thread_win32_osx.h"
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/// Thread class keeps together all the thread-related stuff. We use
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/// per-thread pawn and material hash tables so that once we get a
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/// pointer to an entry its life time is unlimited and we don't have
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/// to care about someone changing the entry under our feet.
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class Thread {
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std::mutex mutex;
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std::condition_variable cv;
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size_t idx;
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bool exit = false, searching = true; // Set before starting std::thread
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NativeThread stdThread;
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public:
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explicit Thread(size_t);
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virtual ~Thread();
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virtual void search();
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void clear();
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void idle_loop();
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void start_searching();
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void wait_for_search_finished();
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int best_move_count(Move move) const;
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Pawns::Table pawnsTable;
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Material::Table materialTable;
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size_t pvIdx, pvLast;
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uint64_t ttHitAverage;
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int selDepth, nmpMinPly;
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Color nmpColor;
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std::atomic<uint64_t> nodes, tbHits, bestMoveChanges;
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Position rootPos;
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StateInfo rootState;
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Search::RootMoves rootMoves;
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Depth rootDepth, completedDepth;
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CounterMoveHistory counterMoves;
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ButterflyHistory mainHistory;
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LowPlyHistory lowPlyHistory;
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CapturePieceToHistory captureHistory;
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ContinuationHistory continuationHistory[2][2];
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Score contempt;
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bool rootInTB;
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};
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/// MainThread is a derived class specific for main thread
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struct MainThread : public Thread {
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using Thread::Thread;
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void search() override;
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void check_time();
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double previousTimeReduction;
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Value bestPreviousScore;
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Value iterValue[4];
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int callsCnt;
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bool stopOnPonderhit;
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std::atomic_bool ponder;
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};
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/// ThreadPool struct handles all the threads-related stuff like init, starting,
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/// parking and, most importantly, launching a thread. All the access to threads
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/// is done through this class.
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struct ThreadPool : public std::vector<Thread*> {
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void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
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void clear();
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void set(size_t);
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MainThread* main() const { return static_cast<MainThread*>(front()); }
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uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
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uint64_t tb_hits() const { return accumulate(&Thread::tbHits); }
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Thread* get_best_thread() const;
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void start_searching();
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void wait_for_search_finished() const;
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std::atomic_bool stop, increaseDepth;
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private:
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StateListPtr setupStates;
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uint64_t accumulate(std::atomic<uint64_t> Thread::* member) const {
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uint64_t sum = 0;
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for (Thread* th : *this)
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sum += (th->*member).load(std::memory_order_relaxed);
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return sum;
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}
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};
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extern ThreadPool Threads;
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#endif // #ifndef THREAD_H_INCLUDED
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