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) 2015-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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 "search.h"
#include "thread_win32.h"
-struct Thread;
-const size_t MAX_THREADS = 128;
+/// 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.
+class Thread {
-/// ThreadBase struct is the base of the hierarchy from where we derive all the
-/// specialized thread classes.
-
-struct ThreadBase : public std::thread {
-
- virtual ~ThreadBase() = default;
- virtual void idle_loop() = 0;
- void notify_one();
- void wait(volatile const bool& b);
- void wait_while(volatile const bool& b);
-
+ std::thread nativeThread;
Mutex mutex;
ConditionVariable sleepCondition;
- volatile bool exit = false;
-};
-
-
-/// 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 {
+ bool exit, searching;
+public:
Thread();
- virtual void idle_loop();
- void search(bool isMainThread = false);
+ virtual ~Thread();
+ virtual void search();
+ void idle_loop();
+ void start_searching(bool resume = false);
+ void wait_for_search_finished();
+ void wait(std::atomic_bool& b);
Pawns::Table pawnsTable;
Material::Table materialTable;
Endgames endgames;
size_t idx, PVIdx;
- int maxPly;
- volatile bool searching;
+ int maxPly, callsCnt;
Position rootPos;
Search::RootMoveVector rootMoves;
- Search::Stack stack[MAX_PLY+4];
- HistoryStats History;
- MovesStats Countermoves;
- Depth depth;
+ Depth rootDepth;
+ HistoryStats history;
+ MoveStats counterMoves;
+ Depth completedDepth;
+ std::atomic_bool resetCalls;
};
-/// MainThread and TimerThread are derived classes used to characterize the two
-/// special threads: the main one and the recurring timer.
+/// MainThread is a derived class with a specific overload for the main thread
struct MainThread : public Thread {
- virtual void idle_loop();
- void join();
- void think();
- volatile bool thinking = true; // Avoid a race with start_thinking()
-};
-
-struct TimerThread : public ThreadBase {
-
- static const int Resolution = 5; // Millisec between two check_time() calls
+ virtual void search();
- virtual void idle_loop();
-
- bool run = false;
+ bool easyMovePlayed, failedLow;
+ double bestMoveChanges;
+ Value previousScore;
};
-/// ThreadPool struct handles all the threads related stuff like init, starting,
-/// parking and, most importantly, launching a slave thread at a split point.
-/// All the access to shared thread 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
+/// data is done through this class.
struct ThreadPool : public std::vector<Thread*> {
- void init(); // No c'tor and d'tor, threads rely on globals that should be
- void exit(); // initialized and are valid during the whole thread lifetime.
+ void init(); // No constructor and destructor, threads rely on globals that should
+ void exit(); // be initialized and valid during the whole thread lifetime.
MainThread* main() { return static_cast<MainThread*>(at(0)); }
- void read_uci_options();
void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
+ void read_uci_options();
int64_t nodes_searched();
- TimerThread* timer;
};
extern ThreadPool Threads;