/*
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) 2008-2012 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
#if !defined(THREAD_H_INCLUDED)
#define THREAD_H_INCLUDED
-#include <cstring>
+#include <set>
#include "lock.h"
#include "material.h"
#include "movepick.h"
#include "pawns.h"
#include "position.h"
+#include "search.h"
const int MAX_THREADS = 32;
-const int MAX_ACTIVE_SPLIT_POINTS = 8;
+const int MAX_SPLITPOINTS_PER_THREAD = 8;
struct SplitPoint {
SplitPoint* parent;
const Position* pos;
Depth depth;
- bool pvNode;
Value beta;
- int ply;
+ int nodeType;
int master;
Move threatMove;
// Const pointers to shared data
MovePicker* mp;
- SearchStack* ss;
+ Search::Stack* ss;
// Shared data
Lock lock;
+ volatile uint64_t slavesMask;
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
+ volatile bool cutoff;
};
-// 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.
+/// 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 {
+
+ void wake_up();
+ bool cutoff_occurred() const;
+ bool is_available_to(int master) const;
+ void idle_loop(SplitPoint* sp_master);
+ void main_loop();
+ void timer_loop();
+ void wait_for_stop_or_ponderhit();
+
+ SplitPoint splitPoints[MAX_SPLITPOINTS_PER_THREAD];
MaterialInfoTable materialTable;
PawnInfoTable pawnTable;
+ int threadID;
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);
- }
+ ThreadHandle handle;
+ SplitPoint* volatile curSplitPoint;
+ volatile int splitPointsCnt;
+ volatile bool is_searching;
+ volatile bool do_sleep;
+ volatile bool do_exit;
};
-// 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.
+/// ThreadsManager class handles 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.
class ThreadsManager {
/* As long as the single ThreadsManager object is defined as a global we don't
*/
public:
Thread& operator[](int threadID) { return threads[threadID]; }
- void init_threads();
- void exit_threads();
- void init_hash_tables();
+ void init();
+ void exit();
+ bool use_sleeping_threads() const { return useSleepingThreads; }
int min_split_depth() const { return minimumSplitDepth; }
- int active_threads() const { return activeThreads; }
- void set_active_threads(int cnt) { activeThreads = cnt; }
+ int size() const { return activeThreads; }
+ void set_size(int 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);
+ bool available_slave_exists(int master) const;
+ void set_timer(int msec);
+ void stop_thinking();
+ void start_thinking(const Position& pos, const Search::LimitsType& limits,
+ const std::set<Move>& = std::set<Move>(), bool async = false);
template <bool Fake>
- void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
- Depth depth, Move threatMove, int moveCount, MovePicker* mp, bool pvNode);
+ Value split(Position& pos, Search::Stack* ss, Value alpha, Value beta, Value bestValue,
+ Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
private:
- Lock mpLock;
+ friend struct Thread;
+
+ Thread threads[MAX_THREADS + 1]; // Last one is used as a timer
+ Lock splitLock;
+ WaitCondition sleepCond;
Depth minimumSplitDepth;
int maxThreadsPerSplitPoint;
- bool useSleepingThreads;
int activeThreads;
- volatile bool allThreadsShouldExit;
- Thread threads[MAX_THREADS];
+ bool useSleepingThreads;
};
-extern ThreadsManager ThreadsMgr;
+extern ThreadsManager Threads;
#endif // !defined(THREAD_H_INCLUDED)
projects / stockfish / blobdiff