X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fthread.h;h=d6a48eca73d14937f19212d462d9a120398d21d0;hp=9b2e359b972b5e3fab9f2babe84f589c9e3ead7a;hb=HEAD;hpb=2783203428300cf0a6305b64691ad38fa340f253

diff --git a/src/thread.h b/src/thread.h
index 9b2e359b..cb2f6db1 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -1,8 +1,6 @@
 /*
   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) 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
@@ -23,89 +21,115 @@
 
 #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 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.
 class Thread {
 
-  std::thread nativeThread;
-  Mutex mutex;
-  ConditionVariable sleepCondition;
-  bool exit, searching;
-
-public:
-  Thread();
-  virtual ~Thread();
-  virtual void search();
-  void idle_loop();
-  void start_searching();
-  void wait_for_search_finished();
-
-  Pawns::Table pawnsTable;
-  Material::Table materialTable;
-  Endgames endgames;
-  size_t idx, PVIdx;
-  int selDepth;
-  std::atomic<uint64_t> nodes, tbHits;
-
-  Position rootPos;
-  Search::RootMoves rootMoves;
-  Depth rootDepth;
-  Depth completedDepth;
-  CounterMoveHistory counterMoves;
-  ButterflyHistory mainHistory;
-  ContinuationHistory contHistory;
+    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 with a specific overload for the main thread
+// MainThread is a derived class specific for main thread
+struct MainThread: public Thread {
+
+    using Thread::Thread;
 
-struct MainThread : public Thread {
-  virtual void search();
-  void check_time();
+    void search() override;
+    void check_time();
 
-  bool easyMovePlayed, failedLow;
-  double bestMoveChanges;
-  Value previousScore;
-  int callsCnt = 0;
+    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
-/// data 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 {
+
+    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(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
-  void read_uci_options();
-  uint64_t nodes_searched() const;
-  uint64_t tb_hits() const;
+    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(); }
 
-  std::atomic_bool stop, ponder, stopOnPonderhit;
+   private:
+    StateListPtr         setupStates;
+    std::vector<Thread*> threads;
 
-private:
-  StateListPtr setupStates;
+    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;
 
-#endif // #ifndef THREAD_H_INCLUDED
+}  // namespace Stockfish
+
+#endif  // #ifndef THREAD_H_INCLUDED