src/share/vm/runtime/thread.hpp

*** 204,218 ****
--- 204,232 ----
    volatile uint32_t _suspend_flags;
  
   private:
    int _num_nested_signal;
  
+   DEBUG_ONLY(bool _suspendible_thread;)
+ 
   public:
    void enter_signal_handler() { _num_nested_signal++; }
    void leave_signal_handler() { _num_nested_signal--; }
    bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
  
+ #ifdef ASSERT
+   void set_suspendible_thread() {
+     _suspendible_thread = true;
+   }
+ 
+   void clear_suspendible_thread() {
+     _suspendible_thread = false;
+   }
+ 
+   bool is_suspendible_thread() { return _suspendible_thread; }
+ #endif
+ 
   private:
    // Active_handles points to a block of handles
    JNIHandleBlock* _active_handles;
  
    // One-element thread local free list