Use std::atomic for fRequestShutdown and fReopenDebugLog

src/util.h

@@ -18,6 +18,7 @@
 #include "tinyformat.h"
 #include "utiltime.h"
 
+#include <atomic>
 #include <exception>
 #include <map>
 #include <stdint.h>
@@ -59,7 +60,7 @@ extern std::string strMiscWarning;
 extern bool fLogTimestamps;
 extern bool fLogTimeMicros;
 extern bool fLogIPs;
-extern volatile bool fReopenDebugLog;
+extern std::atomic<bool> fReopenDebugLog;
 extern CTranslationInterface translationInterface;
 
 extern const char * const BITCOIN_CONF_FILENAME;