2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2009 Marco Costalba
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #if !defined(THREAD_H_INCLUDED)
22 #define THREAD_H_INCLUDED
38 //// Constants and variables
41 const int MAX_THREADS = 8;
42 const int ACTIVE_SPLIT_POINTS_MAX = 8;
51 // Const data after splitPoint has been setup
58 int ply, master, slaves[MAX_THREADS];
59 SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
61 // Const pointers to shared data
63 SearchStack* parentSstack;
68 volatile Value bestValue;
71 volatile bool stopRequest;
74 // ThreadState type is used to represent thread's current state
78 THREAD_SEARCHING, // thread is performing work
79 THREAD_AVAILABLE, // thread is polling for work
80 THREAD_SLEEPING, // we are not thinking, so thread is sleeping
81 THREAD_BOOKED, // other thread (master) has booked us as a slave
82 THREAD_WORKISWAITING, // master has ordered us to start
83 THREAD_TERMINATED // we are quitting and thread is terminated
87 SplitPoint* splitPoint;
88 volatile int activeSplitPoints;
90 uint64_t betaCutOffs[2];
91 volatile ThreadState state;
92 unsigned char pad[64]; // set some distance among local data for each thread
96 #endif // !defined(THREAD_H_INCLUDED)