Move stop signal to Threads

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index e6c3cd701485947c1c174b98f037661dca03409e..1c000b5bad78a8d847d5f4d8c3ecfe130dff2e48 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -39,7 +39,6 @@
 
 namespace Search {
 
-  SignalsType Signals;
   LimitsType Limits;
 }
 
@@ -271,18 +270,18 @@ void MainThread::search() {
       Time.availableNodes += Limits.inc[us] - Threads.nodes_searched();
 
   // When we reach the maximum depth, we can arrive here without a raise of
-  // Signals.stop. However, if we are pondering or in an infinite search,
+  // Threads.stop. However, if we are pondering or in an infinite search,
   // the UCI protocol states that we shouldn't print the best move before the
   // GUI sends a "stop" or "ponderhit" command. We therefore simply wait here
-  // until the GUI sends one of those commands (which also raises Signals.stop).
-  if (!Signals.stop && (Limits.ponder || Limits.infinite))
+  // until the GUI sends one of those commands (which also raises Threads.stop).
+  if (!Threads.stop && (Limits.ponder || Limits.infinite))
   {
-      Signals.stopOnPonderhit = true;
-      wait(Signals.stop);
+      Threads.stopOnPonderhit = true;
+      wait(Threads.stop);
   }
 
   // Stop the threads if not already stopped
-  Signals.stop = true;
+  Threads.stop = true;
 
   // Wait until all threads have finished
   for (Thread* th : Threads)
@@ -360,9 +359,9 @@ void Thread::search() {
   multiPV = std::min(multiPV, rootMoves.size());
 
   // Iterative deepening loop until requested to stop or the target depth is reached
-  while (   (rootDepth = rootDepth + ONE_PLY) < DEPTH_MAX
-         && !Signals.stop
-         && (!Limits.depth || Threads.main()->rootDepth / ONE_PLY <= Limits.depth))
+  while (   (rootDepth += ONE_PLY) < DEPTH_MAX
+         && !Threads.stop
+         && !(Limits.depth && mainThread && rootDepth / ONE_PLY > Limits.depth))
   {
       // Distribute search depths across the threads
       if (idx)
@@ -382,7 +381,7 @@ void Thread::search() {
           rm.previousScore = rm.score;
 
       // MultiPV loop. We perform a full root search for each PV line
-      for (PVIdx = 0; PVIdx < multiPV && !Signals.stop; ++PVIdx)
+      for (PVIdx = 0; PVIdx < multiPV && !Threads.stop; ++PVIdx)
       {
           // Reset aspiration window starting size
           if (rootDepth >= 5 * ONE_PLY)
@@ -410,7 +409,7 @@ void Thread::search() {
               // If search has been stopped, we break immediately. Sorting and
               // writing PV back to TT is safe because RootMoves is still
               // valid, although it refers to the previous iteration.
-              if (Signals.stop)
+              if (Threads.stop)
                   break;
 
               // When failing high/low give some update (without cluttering
@@ -431,7 +430,7 @@ void Thread::search() {
                   if (mainThread)
                   {
                       mainThread->failedLow = true;
-                      Signals.stopOnPonderhit = false;
+                      Threads.stopOnPonderhit = false;
                   }
               }
               else if (bestValue >= beta)
@@ -453,11 +452,11 @@ void Thread::search() {
           if (!mainThread)
               continue;
 
-          if (Signals.stop || PVIdx + 1 == multiPV || Time.elapsed() > 3000)
+          if (Threads.stop || PVIdx + 1 == multiPV || Time.elapsed() > 3000)
               sync_cout << UCI::pv(rootPos, rootDepth, alpha, beta) << sync_endl;
       }
 
-      if (!Signals.stop)
+      if (!Threads.stop)
           completedDepth = rootDepth;
 
       if (!mainThread)
@@ -471,12 +470,12 @@ void Thread::search() {
       if (   Limits.mate
           && bestValue >= VALUE_MATE_IN_MAX_PLY
           && VALUE_MATE - bestValue <= 2 * Limits.mate)
-          Signals.stop = true;
+          Threads.stop = true;
 
       // Do we have time for the next iteration? Can we stop searching now?
       if (Limits.use_time_management())
       {
-          if (!Signals.stop && !Signals.stopOnPonderhit)
+          if (!Threads.stop && !Threads.stopOnPonderhit)
           {
               // Stop the search if only one legal move is available, or if all
               // of the available time has been used, or if we matched an easyMove
@@ -498,9 +497,9 @@ void Thread::search() {
                   // If we are allowed to ponder do not stop the search now but
                   // keep pondering until the GUI sends "ponderhit" or "stop".
                   if (Limits.ponder)
-                      Signals.stopOnPonderhit = true;
+                      Threads.stopOnPonderhit = true;
                   else
-                      Signals.stop = true;
+                      Threads.stop = true;
               }
           }
 
@@ -573,7 +572,7 @@ namespace {
     if (!rootNode)
     {
         // Step 2. Check for aborted search and immediate draw
-        if (Signals.stop.load(std::memory_order_relaxed) || pos.is_draw(ss->ply) || ss->ply >= MAX_PLY)
+        if (Threads.stop.load(std::memory_order_relaxed) || pos.is_draw(ss->ply) || ss->ply >= MAX_PLY)
             return ss->ply >= MAX_PLY && !inCheck ? evaluate(pos)
                                                   : DrawValue[pos.side_to_move()];
 
@@ -1032,7 +1031,7 @@ moves_loop: // When in check search starts from here
       // Finished searching the move. If a stop occurred, the return value of
       // the search cannot be trusted, and we return immediately without
       // updating best move, PV and TT.
-      if (Signals.stop.load(std::memory_order_relaxed))
+      if (Threads.stop.load(std::memory_order_relaxed))
           return VALUE_ZERO;
 
       if (rootNode)
@@ -1093,7 +1092,7 @@ moves_loop: // When in check search starts from here
     // completed. But in this case bestValue is valid because we have fully
     // searched our subtree, and we can anyhow save the result in TT.
     /*
-       if (Signals.stop)
+       if (Threads.stop)
         return VALUE_DRAW;
     */
 
@@ -1491,7 +1490,7 @@ moves_loop: // When in check search starts from here
     if (   (Limits.use_time_management() && elapsed > Time.maximum() - 10)
         || (Limits.movetime && elapsed >= Limits.movetime)
         || (Limits.nodes && Threads.nodes_searched() >= (uint64_t)Limits.nodes))
-            Signals.stop = true;
+            Threads.stop = true;
   }