/*
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
//// Constants and variables
////
-const int THREAD_MAX = 8;
+const int MAX_THREADS = 8;
const int ACTIVE_SPLIT_POINTS_MAX = 8;
////
struct SplitPoint {
- SplitPoint *parent;
+
+ // Const data after splitPoint has been setup
+ SplitPoint* parent;
const Position* pos;
- SearchStack sstack[THREAD_MAX][PLY_MAX_PLUS_2];
- SearchStack *parentSstack;
- int ply;
Depth depth;
- volatile Value alpha, beta, bestValue;
- Value futilityValue;
- bool pvNode;
- int master, slaves[THREAD_MAX];
+ bool pvNode, mateThreat;
+ Value beta;
+ int ply, master, slaves[MAX_THREADS];
+ SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
+
+ // Const pointers to shared data
+ MovePicker* mp;
+ SearchStack* parentSstack;
+
+ // Shared data
Lock lock;
- MovePicker *mp;
+ volatile Value alpha;
+ volatile Value bestValue;
volatile int moves;
volatile int cpus;
- bool finished;
+ volatile bool stopRequest;
};
+// ThreadState type is used to represent thread's current state
-struct Thread {
-
- Thread() { memset(this, 0, sizeof(Thread)); }
+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
+};
- SplitPoint *splitPoint;
+struct Thread {
+ SplitPoint* splitPoint;
volatile int activeSplitPoints;
uint64_t nodes;
uint64_t betaCutOffs[2];
- volatile bool stop;
- volatile bool running;
- volatile bool idle;
- volatile bool sleeping;
- volatile bool workIsWaiting;
- volatile bool printCurrentLine;
+ volatile ThreadState state;
unsigned char pad[64]; // set some distance among local data for each thread
};