141   // hold the Threads_lock or are at a safepoint.

   141   // hold the Threads_lock or are at a safepoint.

   142   virtual void on_thread_attach(Thread* thread) {}

   142   virtual void on_thread_attach(Thread* thread) {}

   143   virtual void on_thread_detach(Thread* thread) {}

   143   virtual void on_thread_detach(Thread* thread) {}

   144 

   144 

   145   virtual void make_parsable(JavaThread* thread) {}

   145   virtual void make_parsable(JavaThread* thread) {}

   150 

   146 

   151 public:

   147 public:

   152   // Print a description of the memory for the barrier set

   148   // Print a description of the memory for the barrier set

   153   virtual void print_on(outputStream* st) const = 0;

   149   virtual void print_on(outputStream* st) const = 0;

   154 

   150