Initialize a new split point out of lock

[stockfish] / src / thread.h

diff --git a/src/thread.h b/src/thread.h
index 3cc526ce5c127e3be85299e20775d4a42b9870f6..1e92b77625ac18419061353dae1df08e2dfd9acf 100644 (file)
--- a/src/thread.h
+++ b/src/thread.h
@@ -17,43 +17,28 @@
   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 "material.h"
 #include "movepick.h"
+#include "pawns.h"
 #include "position.h"
-#include "search.h"
-
 
-////
-//// Constants and variables
-////
-
-const int MAX_THREADS = 16;
+const int MAX_THREADS = 32;
 const int MAX_ACTIVE_SPLIT_POINTS = 8;
 
-
-////
-//// Types
-////
-
 struct SplitPoint {
 
   // Const data after splitPoint has been setup
   SplitPoint* parent;
   const Position* pos;
   Depth depth;
-  bool pvNode, mateThreat;
   Value beta;
+  int nodeType;
   int ply;
   int master;
   Move threatMove;
@@ -68,28 +53,80 @@ struct SplitPoint {
   volatile Value alpha;
   volatile Value bestValue;
   volatile int moveCount;
-  volatile bool betaCutoff;
-  volatile int slaves[MAX_THREADS];
+  volatile bool is_betaCutoff;
+  volatile bool is_slave[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
-};
+/// Thread struct is used to keep 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 {
+
+  enum ThreadState
+  {
+    INITIALIZING,  // Thread is initializing itself
+    SEARCHING,     // Thread is performing work
+    AVAILABLE,     // Thread is waiting for work
+    BOOKED,        // Other thread (master) has booked us as a slave
+    WORKISWAITING, // Master has ordered us to start
+    TERMINATED     // We are quitting and thread is terminated
+  };
+
+  void wake_up();
+  bool cutoff_occurred() const;
+  bool is_available_to(int master) const;
+
+  SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
+  MaterialInfoTable materialTable;
+  PawnInfoTable pawnTable;
+  int maxPly;
+  Lock sleepLock;
+  WaitCondition sleepCond;
   volatile ThreadState state;
   SplitPoint* volatile splitPoint;
   volatile int activeSplitPoints;
-  SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
 };
 
 
+/// 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();
+  void exit();
+  void init_hash_tables();
+
+  int min_split_depth() const { return minimumSplitDepth; }
+  int size() const { return activeThreads; }
+  void set_size(int cnt) { activeThreads = cnt; }
+
+  void read_uci_options();
+  bool available_slave_exists(int master) const;
+  void idle_loop(int threadID, SplitPoint* sp);
+
+  template <bool Fake>
+  void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
+             Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
+private:
+  Thread threads[MAX_THREADS];
+  Lock threadsLock;
+  Depth minimumSplitDepth;
+  int maxThreadsPerSplitPoint;
+  int activeThreads;
+  bool useSleepingThreads;
+  volatile bool allThreadsShouldExit;
+};
+
+extern ThreadsManager Threads;
+
 #endif // !defined(THREAD_H_INCLUDED)