X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fthread.h;h=38a29e8dc00d6c07bd88f097830ff8ce3d378a4c;hb=86f04dbcc08e52864c1136d713996e3a0c8d2610;hp=df42c5aa756d0ff11ceb9cc34e720c5827d2ae8e;hpb=ed04c010eb4a569532f322f5030d468380b3ab57;p=stockfish
diff --git a/src/thread.h b/src/thread.h
index df42c5aa..c1e55322 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -1,7 +1,7 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, 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
@@ -17,125 +17,106 @@
along with this program. If not, see .
*/
-#if !defined(THREAD_H_INCLUDED)
+#ifndef THREAD_H_INCLUDED
#define THREAD_H_INCLUDED
-#include
+#include
+#include
+#include
+#include
+#include
+#include
-#include "lock.h"
#include "material.h"
#include "movepick.h"
#include "pawns.h"
#include "position.h"
#include "search.h"
+#include "thread_win32.h"
-const int MAX_THREADS = 32;
-const int MAX_ACTIVE_SPLIT_POINTS = 8;
-
-struct SplitPoint {
-
- // Const data after splitPoint has been setup
- SplitPoint* parent;
- const Position* pos;
- Depth depth;
- Value beta;
- int nodeType;
- int ply;
- int master;
- Move threatMove;
-
- // Const pointers to shared data
- MovePicker* mp;
- SearchStack* ss;
-
- // Shared data
- Lock lock;
- volatile int64_t nodes;
- volatile Value alpha;
- volatile Value bestValue;
- volatile int moveCount;
- volatile bool is_betaCutoff;
- volatile bool is_slave[MAX_THREADS];
+
+/// ThreadBase struct is the base of the hierarchy from where we derive all the
+/// specialized thread classes.
+
+struct ThreadBase : public std::thread {
+
+ ThreadBase() { exit = false; }
+ virtual ~ThreadBase() = default;
+ virtual void idle_loop() = 0;
+ void notify_one();
+ void wait(std::atomic& b);
+ void wait_while(std::atomic& b);
+
+ Mutex mutex;
+ ConditionVariable sleepCondition;
+ std::atomic exit;
};
-/// Thread struct is used to keep 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.
+/// Thread struct keeps together all the thread related stuff like locks, state,
+/// history and countermoves tables. 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 {
+struct Thread : public ThreadBase {
- void wake_up();
- bool cutoff_occurred() const;
- bool is_available_to(int master) const;
- void idle_loop(SplitPoint* sp);
- void main_loop();
- void timer_loop();
+ Thread();
+ virtual void idle_loop();
+ void search(bool isMainThread = false);
- SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
- MaterialInfoTable materialTable;
- PawnInfoTable pawnTable;
- int threadID;
+ Pawns::Table pawnsTable;
+ Material::Table materialTable;
+ Endgames endgames;
+ size_t idx, PVIdx;
int maxPly;
- Lock sleepLock;
- WaitCondition sleepCond;
- SplitPoint* volatile splitPoint;
- volatile int activeSplitPoints;
- volatile bool is_searching;
- volatile bool do_sleep;
- volatile bool do_terminate;
-
-#if defined(_MSC_VER)
- HANDLE handle;
-#else
- pthread_t handle;
-#endif
+ std::atomic searching;
+
+ Position rootPos;
+ Search::RootMoveVector rootMoves;
+ Depth rootDepth;
+ HistoryStats history;
+ MovesStats counterMoves;
+};
+
+
+/// MainThread and TimerThread are derived classes used to characterize the two
+/// special threads: the main one and the recurring timer.
+
+struct MainThread : public Thread {
+ MainThread() { thinking = true; } // Avoid a race with start_thinking()
+ virtual void idle_loop();
+ void join();
+ void think();
+ std::atomic thinking;
+};
+
+struct TimerThread : public ThreadBase {
+
+ static const int Resolution = 5; // Millisec between two check_time() calls
+
+ virtual void idle_loop();
+ void check_time();
+
+ bool run = false;
};
-/// ThreadsManager class is used to handle 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.
+/// ThreadPool struct handles all the threads related stuff like init, starting,
+/// parking and, most importantly, launching a thread.
+/// All the access to shared thread data is done through this class.
-class ThreadsManager {
- /* As long as the single ThreadsManager object is defined as a global we don't
- need to explicitly initialize to zero its data members because variables with
- static storage duration are automatically set to zero before enter main()
- */
-public:
- Thread& operator[](int threadID) { return threads[threadID]; }
- void init();
- void exit();
+struct ThreadPool : public std::vector {
- bool use_sleeping_threads() const { return useSleepingThreads; }
- int min_split_depth() const { return minimumSplitDepth; }
- int size() const { return activeThreads; }
+ void init(); // No constructor and destructor, threads rely on globals that should
+ void exit(); // be initialized and valid during the whole thread lifetime.
- void set_size(int cnt);
+ MainThread* main() { return static_cast(at(0)); }
void read_uci_options();
- bool available_slave_exists(int master) const;
- bool split_point_finished(SplitPoint* sp) const;
-
- void start_thinking(bool asyncMode = true);
- void set_timer(int msec);
- void wait_for_stop_or_ponderhit();
-
- template
- Value split(Position& pos, SearchStack* ss, Value alpha, Value beta, Value bestValue,
- Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
-private:
- friend struct Thread;
-
- Thread threads[MAX_THREADS + 2]; // Last 2 are the listener and the timer
- Lock threadsLock;
- Depth minimumSplitDepth;
- int maxThreadsPerSplitPoint;
- int activeThreads;
- bool useSleepingThreads;
- WaitCondition sleepCond;
+ void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
+ int64_t nodes_searched();
+ TimerThread* timer;
};
-extern ThreadsManager Threads;
+extern ThreadPool Threads;
-#endif // !defined(THREAD_H_INCLUDED)
+#endif // #ifndef THREAD_H_INCLUDED