--- a/src/hotspot/share/runtime/os.hpp	Thu Mar 07 16:15:43 2019 +0100
+++ b/src/hotspot/share/runtime/os.hpp	Fri Mar 08 11:23:30 2019 +0100
@@ -463,6 +463,9 @@
   static void pd_start_thread(Thread* thread);
   static void start_thread(Thread* thread);
 
+  // Returns true if successful.
+  static bool signal_thread(Thread* thread, int sig, const char* reason);
+
   static void free_thread(OSThread* osthread);
 
   // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
@@ -637,6 +640,7 @@
   static void print_environment_variables(outputStream* st, const char** env_list);
   static void print_context(outputStream* st, const void* context);
   static void print_register_info(outputStream* st, const void* context);
+  static bool signal_sent_by_kill(const void* siginfo);
   static void print_siginfo(outputStream* st, const void* siginfo);
   static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
   static void print_date_and_time(outputStream* st, char* buf, size_t buflen);