Compute SplitPoint::spLevel on the fly

[stockfish] / src / thread.cpp

diff --git a/src/thread.cpp b/src/thread.cpp
index b8571dcd20283c9b9b7ef502559e7ca91ff05db5..5c013c6a0b72e06830d2a7389706f45d73b9a43a 100644 (file)
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -155,6 +155,7 @@ void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bes
   sp.masterThread = this;
   sp.parentSplitPoint = activeSplitPoint;
   sp.slavesMask = 0, sp.slavesMask.set(idx);
+  sp.slavesCount = 1;
   sp.depth = depth;
   sp.bestValue = *bestValue;
   sp.bestMove = *bestMove;
@@ -182,9 +183,11 @@ void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bes
 
   Thread* slave;
 
-  while ((slave = Threads.available_slave(this)) != NULL)
+  while (    sp.slavesCount < MAX_SLAVES_PER_SPLITPOINT
+         && (slave = Threads.available_slave(this)) != NULL)
   {
       sp.slavesMask.set(slave->idx);
+      sp.slavesCount++;
       slave->activeSplitPoint = &sp;
       slave->searching = true; // Slave leaves idle_loop()
       slave->notify_one(); // Could be sleeping