Use atomics instead of volatile

[stockfish] / src / search.h

diff --git a/src/search.h b/src/search.h
index c7abb9dcfd97a2b5b47b87f798fc4e5718cd2bb7..740063b9a59c5d4ff1c4db19bd18416ac4b32e58 100644 (file)
--- a/src/search.h
+++ b/src/search.h
@@ -20,7 +20,8 @@
 #ifndef SEARCH_H_INCLUDED
 #define SEARCH_H_INCLUDED
 
 #ifndef SEARCH_H_INCLUDED
 #define SEARCH_H_INCLUDED
 

-#include <memory>  // For std::auto_ptr
+#include <atomic>
+#include <memory>  // For std::unique_ptr

 #include <stack>
 #include <vector>
 
 #include <stack>
 #include <vector>
 


@@ -91,16 +92,16 @@ struct LimitsType {
   TimePoint startTime;
 };
 
   TimePoint startTime;
 };
 

-/// The SignalsType struct stores volatile flags updated during the search
+/// The SignalsType struct stores atomic flags updated during the search

 /// typically in an async fashion e.g. to stop the search by the GUI.
 
 struct SignalsType {
 /// typically in an async fashion e.g. to stop the search by the GUI.
 
 struct SignalsType {

-  bool stop, stopOnPonderhit, firstRootMove, failedLowAtRoot;
+  std::atomic<bool> stop, stopOnPonderhit, firstRootMove, failedLowAtRoot;

 };
 
 typedef std::unique_ptr<std::stack<StateInfo>> StateStackPtr;
 
 };
 
 typedef std::unique_ptr<std::stack<StateInfo>> StateStackPtr;
 

-extern volatile SignalsType Signals;
+extern SignalsType Signals;

 extern LimitsType Limits;
 extern StateStackPtr SetupStates;
 
 extern LimitsType Limits;
 extern StateStackPtr SetupStates;