X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=45e91e591ad768e213d7b003dd7dad5f4ffc3137;hp=097243a0c73b45daa354f14985cc8e1ad12828f4;hb=62b43130e27e4322c5edde976d0827840b9deee4;hpb=b95ba7b37ea278837c83cb65c1b7ad0e71e8d9f2

diff --git a/src/search.cpp b/src/search.cpp
index 097243a0..45e91e59 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1562,8 +1562,14 @@ namespace {
           if (newDepth >= OnePly)
               preFutilityValueMargin = 112 * bitScanReverse32(int(newDepth) * int(newDepth) / 2);
 
-          if (ss[ply].eval + pos.endgame_value_of_piece_on(move_to(move)) + preFutilityValueMargin + ei.futilityMargin + 90 < beta)
+          Value futilityCaptureValue = ss[ply].eval + pos.endgame_value_of_piece_on(move_to(move)) + preFutilityValueMargin + ei.futilityMargin + 90;
+
+          if (futilityCaptureValue < beta)
+          {
+              if (futilityCaptureValue > bestValue)
+                  bestValue = futilityCaptureValue;
               continue;
+          }
       }
 
       // Futility pruning
@@ -1898,28 +1904,29 @@ namespace {
     SearchStack* ss = sp->sstack[threadID];
     Value value = -VALUE_INFINITE;
     Move move;
+    int moveCount;
     bool isCheck = pos.is_check();
     bool useFutilityPruning =     sp->depth < SelectiveDepth
                               && !isCheck;
 
     const int FutilityMoveCountMargin = 3 + (1 << (3 * int(sp->depth) / 8));
 
-    while (    sp->bestValue < sp->beta
+    while (    lock_grab_bool(&(sp->lock))
+           &&  sp->bestValue < sp->beta
            && !thread_should_stop(threadID)
-           && (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE)
+           && (move = sp->mp->get_next_move()) != MOVE_NONE)
     {
+      moveCount = ++sp->moves;
+      lock_release(&(sp->lock));
+
       assert(move_is_ok(move));
 
       bool moveIsCheck = pos.move_is_check(move, ci);
       bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
 
-      lock_grab(&(sp->lock));
-      int moveCount = ++sp->moves;
-      lock_release(&(sp->lock));
-
       ss[sp->ply].currentMove = move;
 
-      // Decide the new search depth.
+      // Decide the new search depth
       bool dangerous;
       Depth ext = extension(pos, move, false, captureOrPromotion, moveIsCheck, false, false, &dangerous);
       Depth newDepth = sp->depth - OnePly + ext;
@@ -1983,7 +1990,10 @@ namespace {
       assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
 
       if (thread_should_stop(threadID))
+      {
+          lock_grab(&(sp->lock));
           break;
+      }
 
       // New best move?
       if (value > sp->bestValue) // Less then 2% of cases
@@ -2006,7 +2016,7 @@ namespace {
       }
     }
 
-    lock_grab(&(sp->lock));
+    /* Here we have the lock still grabbed */
 
     // If this is the master thread and we have been asked to stop because of
     // a beta cutoff higher up in the tree, stop all slave threads.
@@ -2039,24 +2049,25 @@ namespace {
     CheckInfo ci(pos);
     SearchStack* ss = sp->sstack[threadID];
     Value value = -VALUE_INFINITE;
+    int moveCount;
     Move move;
 
-    while (    sp->alpha < sp->beta
+    while (    lock_grab_bool(&(sp->lock))
+           &&  sp->alpha < sp->beta
            && !thread_should_stop(threadID)
-           && (move = sp->mp->get_next_move(sp->lock)) != MOVE_NONE)
+           && (move = sp->mp->get_next_move()) != MOVE_NONE)
     {
-      bool moveIsCheck = pos.move_is_check(move, ci);
-      bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
+      moveCount = ++sp->moves;
+      lock_release(&(sp->lock));
 
       assert(move_is_ok(move));
 
-      lock_grab(&(sp->lock));
-      int moveCount = ++sp->moves;
-      lock_release(&(sp->lock));
+      bool moveIsCheck = pos.move_is_check(move, ci);
+      bool captureOrPromotion = pos.move_is_capture_or_promotion(move);
 
       ss[sp->ply].currentMove = move;
 
-      // Decide the new search depth.
+      // Decide the new search depth
       bool dangerous;
       Depth ext = extension(pos, move, true, captureOrPromotion, moveIsCheck, false, false, &dangerous);
       Depth newDepth = sp->depth - OnePly + ext;
@@ -2116,7 +2127,10 @@ namespace {
       assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
 
       if (thread_should_stop(threadID))
+      {
+          lock_grab(&(sp->lock));
           break;
+      }
 
       // New best move?
       if (value > sp->bestValue) // Less then 2% of cases
@@ -2155,7 +2169,7 @@ namespace {
       }
     }
 
-    lock_grab(&(sp->lock));
+    /* Here we have the lock still grabbed */
 
     // If this is the master thread and we have been asked to stop because of
     // a beta cutoff higher up in the tree, stop all slave threads.