diff -r 7e0f81f63890 -r 7b89c53db169 src/hotspot/share/jfr/recorder/service/jfrRecorderService.hpp
--- a/src/hotspot/share/jfr/recorder/service/jfrRecorderService.hpp	Sun Oct 13 12:36:51 2019 +0200
+++ b/src/hotspot/share/jfr/recorder/service/jfrRecorderService.hpp	Sun Oct 13 16:46:15 2019 +0200
@@ -33,6 +33,7 @@
 class JfrStackTraceRepository;
 class JfrStorage;
 class JfrStringPool;
+class Thread;
 
 class JfrRecorderService : public StackObj {
  private:
@@ -49,6 +50,7 @@
   void finalize_current_chunk();
   void prepare_for_vm_error_rotation();
   void vm_error_rotation();
+  void invoke_flush(Thread* t);
 
   void clear();
   void pre_safepoint_clear();