X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fthread.h;h=114769d2fa19a355ec0de44c7f75801534b59316;hb=434b2c72a44ba255c14957f519e3993ea3d5d6bc;hp=87b78136f5c7851b992327cdc03d65205c7becc2;hpb=a4a0ffce711962c0b04b35998c3c06491be373bf;p=stockfish
diff --git a/src/thread.h b/src/thread.h
index 87b78136..114769d2 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
@@ -17,79 +18,108 @@
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
-////
-//// Includes
-////
-
-#include
-
-#include "lock.h"
+#include "material.h"
#include "movepick.h"
+#include "pawns.h"
#include "position.h"
#include "search.h"
+#include "thread_win32_osx.h"
+
+
+/// 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;
+ size_t pvIdx, pvLast;
+ int selDepth, nmpMinPly;
+ Color nmpColor;
+ std::atomic nodes, tbHits, bestMoveChanges;
+
+ Position rootPos;
+ Search::RootMoves rootMoves;
+ Depth rootDepth, completedDepth;
+ CounterMoveHistory counterMoves;
+ ButterflyHistory mainHistory;
+ CapturePieceToHistory captureHistory;
+ ContinuationHistory continuationHistory;
+ Score contempt;
+};
+
+/// MainThread is a derived class specific for main thread
-////
-//// Constants and variables
-////
+struct MainThread : public Thread {
-const int MAX_THREADS = 8;
-const int ACTIVE_SPLIT_POINTS_MAX = 8;
+ using Thread::Thread;
+ void search() override;
+ void check_time();
-////
-//// Types
-////
+ double previousTimeReduction;
+ Value previousScore;
+ int callsCnt;
+ bool stopOnPonderhit;
+ std::atomic_bool ponder;
+};
-struct SplitPoint {
- // Const data after splitPoint has been setup
- SplitPoint* parent;
- const Position* pos;
- Depth depth;
- bool pvNode, mateThreat;
- Value beta;
- int ply, master, slaves[MAX_THREADS];
- SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
+/// 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.
- // Const pointers to shared data
- MovePicker* mp;
- SearchStack* parentSstack;
+struct ThreadPool : public std::vector {
- // Shared data
- Lock lock;
- volatile Value alpha;
- volatile Value bestValue;
- volatile int moves;
- volatile int cpus;
- volatile bool stopRequest;
-};
+ void start_thinking(Position&, StateListPtr&, const Search::LimitsType&, bool = false);
+ void clear();
+ void set(size_t);
-// ThreadState type is used to represent thread's current state
+ 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); }
-enum ThreadState
-{
- THREAD_SEARCHING, // thread is performing work
- THREAD_AVAILABLE, // thread is polling for work
- THREAD_SLEEPING, // we are not thinking, so thread is sleeping
- 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
-};
+ std::atomic_bool stop;
+
+private:
+ StateListPtr setupStates;
+
+ uint64_t accumulate(std::atomic Thread::* member) const {
-struct Thread {
- SplitPoint* splitPoint;
- volatile int activeSplitPoints;
- uint64_t nodes;
- uint64_t betaCutOffs[2];
- volatile ThreadState state;
- unsigned char pad[64]; // set some distance among local data for each thread
+ uint64_t sum = 0;
+ for (Thread* th : *this)
+ sum += (th->*member).load(std::memory_order_relaxed);
+ return sum;
+ }
};
+extern ThreadPool Threads;
-#endif // !defined(THREAD_H_INCLUDED)
+#endif // #ifndef THREAD_H_INCLUDED