X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fthread.h;h=e5a198c88e764902d74ff6f509c4ef4075cefbb5;hp=27c39dff6de928caaa2f12ab78f77fb3b25ae0a1;hb=339e1b49f619ceffa75019e196adf4de74b32cce;hpb=1a03f0b0d369637081e29a235afd0bce4241b6dd
diff --git a/src/thread.h b/src/thread.h
index 27c39dff..e5a198c8 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) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 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
@@ -17,80 +17,119 @@
along with this program. If not, see .
*/
-
#if !defined(THREAD_H_INCLUDED)
#define THREAD_H_INCLUDED
-
-////
-//// Includes
-////
-
#include
#include "lock.h"
+#include "material.h"
#include "movepick.h"
+#include "pawns.h"
#include "position.h"
-#include "search.h"
-
-
-////
-//// Constants and variables
-////
-const int MAX_THREADS = 8;
-const int ACTIVE_SPLIT_POINTS_MAX = 8;
-
-
-////
-//// Types
-////
+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;
- bool pvNode;
Depth depth;
+ bool pvNode;
Value beta;
- int ply, master, slaves[MAX_THREADS];
- SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
+ int ply;
+ int master;
+ Move threatMove;
// Const pointers to shared data
MovePicker* mp;
- SearchStack* parentSstack;
+ SearchStack* ss;
// Shared data
Lock lock;
+ volatile int64_t nodes;
volatile Value alpha;
volatile Value bestValue;
- volatile int moves;
- volatile int cpus;
- volatile bool stopRequest;
+ 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 polling for work
- THREAD_SLEEPING, // we are not thinking, so thread is sleeping
+ 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
};
+
+// 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 {
- SplitPoint* splitPoint;
- volatile int activeSplitPoints;
- uint64_t nodes;
- uint64_t betaCutOffs[2];
- volatile bool printCurrentLineRequest;
+ MaterialInfoTable materialTable;
+ PawnInfoTable pawnTable;
+ int maxPly;
+ Lock sleepLock;
+ WaitCondition sleepCond;
volatile ThreadState state;
- unsigned char pad[64]; // set some distance among local data for each thread
+ SplitPoint* volatile splitPoint;
+ volatile int activeSplitPoints;
+ SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
+
+ void wake_up() {
+ lock_grab(&sleepLock);
+ cond_signal(&sleepCond);
+ lock_release(&sleepLock);
+ }
+};
+
+
+// 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.
+
+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();
+ void init_hash_tables();
+
+ 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];
};
+extern ThreadsManager ThreadsMgr;
#endif // !defined(THREAD_H_INCLUDED)