/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008 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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
-
+
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
#if !defined(THREAD_H_INCLUDED)
#define THREAD_H_INCLUDED
-
-////
-//// Includes
-////
+#include <cstring>
#include "lock.h"
#include "movepick.h"
#include "position.h"
#include "search.h"
-
-////
-//// Constants and variables
-////
-
-const int THREAD_MAX = 8;
-
-
-////
-//// Types
-////
+const int MAX_THREADS = 32;
+const int MAX_ACTIVE_SPLIT_POINTS = 8;
struct SplitPoint {
- SplitPoint *parent;
- Position pos;
- SearchStack sstack[THREAD_MAX][PLY_MAX];
- SearchStack *parentSstack;
- int ply;
+
+ // Const data after splitPoint has been setup
+ SplitPoint* parent;
+ const Position* pos;
Depth depth;
- volatile Value alpha, beta, bestValue;
bool pvNode;
- Bitboard dcCandidates;
- int master, slaves[THREAD_MAX];
+ Value beta;
+ int ply;
+ int master;
+ Move threatMove;
+
+ // Const pointers to shared data
+ MovePicker* mp;
+ SearchStack* ss;
+
+ // Shared data
Lock lock;
- MovePicker *mp;
- volatile int moves;
- volatile int cpus;
- bool finished;
+ 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
+};
struct Thread {
- SplitPoint *splitPoint;
- int activeSplitPoints;
- uint64_t nodes;
- bool failHighPly1;
- volatile bool stop;
- volatile bool running;
- volatile bool idle;
- volatile bool workIsWaiting;
- volatile bool printCurrentLine;
- unsigned char pad[64];
+ 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);
+ }
};
-
#endif // !defined(THREAD_H_INCLUDED)