X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fthread.h;h=124815b4215d368125dbc38a2d4a50cf2d4a3fc8;hb=bad18bccb60c874410edd3f61624696d3abc3cbc;hp=e576a5c4e379017fc9283fbed4e01c7e629c3fef;hpb=fecefbb99cb0147f37d6895765a315f34c935786;p=stockfish
diff --git a/src/thread.h b/src/thread.h
index e576a5c4..af506609 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -1,7 +1,8 @@
/*
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
+ Copyright (C) 2015-2019 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
@@ -17,118 +18,109 @@
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 "lock.h"
#include "material.h"
#include "movepick.h"
#include "pawns.h"
#include "position.h"
+#include "search.h"
+#include "thread_win32_osx.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;
- bool pvNode;
- Value beta;
- 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 betaCutoff;
- volatile int slaves[MAX_THREADS];
-};
-// ThreadState type is used to represent thread's current state
-enum ThreadState
-{
- THREAD_INITIALIZING, // thread is initializing itself
- THREAD_SEARCHING, // thread is performing work
- THREAD_AVAILABLE, // thread is waiting for work
- THREAD_BOOKED, // other thread (master) has booked us as a slave
- THREAD_WORKISWAITING, // master has ordered us to start
- THREAD_TERMINATED // we are quitting and thread is terminated
+/// Thread class keeps together all the thread-related stuff. We 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 {
+
+ Mutex mutex;
+ ConditionVariable 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();
+
+ Pawns::Table pawnsTable;
+ Material::Table materialTable;
+ Endgames endgames;
+ size_t pvIdx, pvLast;
+ int selDepth, nmpMinPly;
+ Color nmpColor;
+ std::atomic nodes, tbHits;
+
+ Position rootPos;
+ Search::RootMoves rootMoves;
+ Depth rootDepth, completedDepth;
+ CounterMoveHistory counterMoves;
+ ButterflyHistory mainHistory;
+ CapturePieceToHistory captureHistory;
+ ContinuationHistory continuationHistory;
+ Score contempt;
};
-// We 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 {
- MaterialInfoTable materialTable;
- PawnInfoTable pawnTable;
- int maxPly;
- Lock sleepLock;
- WaitCondition sleepCond;
- volatile ThreadState state;
- SplitPoint* volatile splitPoint;
- volatile int activeSplitPoints;
- SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
-
- void wake_up() {
- lock_grab(&sleepLock);
- cond_signal(&sleepCond);
- lock_release(&sleepLock);
- }
+/// MainThread is a derived class specific for main thread
+
+struct MainThread : public Thread {
+
+ using Thread::Thread;
+
+ void search() override;
+ void check_time();
+
+ double bestMoveChanges, previousTimeReduction;
+ Value previousScore;
+ int callsCnt;
+ bool stopOnPonderhit;
+ std::atomic_bool ponder;
};
-// 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 threads
+/// is done through this class.
+
+struct ThreadPool : public std::vector {
+
+ void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
+ void clear();
+ void set(size_t);
+
+ MainThread* main() const { return static_cast(front()); }
+ uint64_t nodes_searched() const { return accumulate(&Thread::nodes); }
+ uint64_t tb_hits() const { return accumulate(&Thread::tbHits); }
+
+ std::atomic_bool stop;
-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_threads();
- void exit_threads();
-
- int min_split_depth() const { return minimumSplitDepth; }
- int active_threads() const { return activeThreads; }
- void set_active_threads(int cnt) { activeThreads = cnt; }
-
- void read_uci_options();
- bool available_thread_exists(int master) const;
- bool thread_is_available(int slave, int master) const;
- bool cutoff_at_splitpoint(int threadID) const;
- void idle_loop(int threadID, SplitPoint* sp);
-
- template
- void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
- Depth depth, Move threatMove, int moveCount, MovePicker* mp, bool pvNode);
private:
- Lock mpLock;
- Depth minimumSplitDepth;
- int maxThreadsPerSplitPoint;
- bool useSleepingThreads;
- int activeThreads;
- volatile bool allThreadsShouldExit;
- Thread threads[MAX_THREADS];
+ StateListPtr setupStates;
+
+ uint64_t accumulate(std::atomic Thread::* member) const {
+
+ uint64_t sum = 0;
+ for (Thread* th : *this)
+ sum += (th->*member).load(std::memory_order_relaxed);
+ return sum;
+ }
};
-extern ThreadsManager ThreadsMgr;
+extern ThreadPool Threads;
-#endif // !defined(THREAD_H_INCLUDED)
+#endif // #ifndef THREAD_H_INCLUDED