25 class BasicLock VALUE_OBJ_CLASS_SPEC {

    26   friend class VMStructs;

    27  private:

    28   volatile markOop _displaced_header;

    29  public:

    30   markOop      displaced_header() const               { return _displaced_header; }

    31   void         set_displaced_header(markOop header)   { _displaced_header = header; }

    32 

    33   void print_on(outputStream* st) const;

    34 

    35   // move a basic lock (used during deoptimization

    36   void move_to(oop obj, BasicLock* dest);

    37 

    38   static int displaced_header_offset_in_bytes()       { return offset_of(BasicLock, _displaced_header); }

    39 };

    40 

    41 // A BasicObjectLock associates a specific Java object with a BasicLock.

    42 // It is currently embedded in an interpreter frame.

    43 

    44 // Because some machines have alignment restrictions on the control stack,

    45 // the actual space allocated by the interpreter may include padding words

    46 // after the end of the BasicObjectLock.  Also, in order to guarantee

    47 // alignment of the embedded BasicLock objects on such machines, we

    48 // put the embedded BasicLock at the beginning of the struct.

    49 

    50 class BasicObjectLock VALUE_OBJ_CLASS_SPEC {

    51   friend class VMStructs;

    52  private:

    53   BasicLock _lock;                                    // the lock, must be double word aligned

    54   oop       _obj;                                     // object holds the lock;

    55 

    56  public:

    57   // Manipulation

    58   oop      obj() const                                { return _obj;  }

    59   void set_obj(oop obj)                               { _obj = obj; }

    60   BasicLock* lock()                                   { return &_lock; }

    61 

    62   // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks

    63   //       in interpreter activation frames since it includes machine-specific padding.

    64   static int size()                                   { return sizeof(BasicObjectLock)/wordSize; }

    65 

    66   // GC support

    67   void oops_do(OopClosure* f) { f->do_oop(&_obj); }

    68 

    69   static int obj_offset_in_bytes()                    { return offset_of(BasicObjectLock, _obj);  }

    70   static int lock_offset_in_bytes()                   { return offset_of(BasicObjectLock, _lock); }

    71 };

   172 

   173  public:

   174   static void Initialize () ;

   175   static PerfCounter * _sync_ContendedLockAttempts ;

   176   static PerfCounter * _sync_FutileWakeups ;

   177   static PerfCounter * _sync_Parks ;

   178   static PerfCounter * _sync_EmptyNotifications ;

   179   static PerfCounter * _sync_Notifications ;

   180   static PerfCounter * _sync_SlowEnter ;

   181   static PerfCounter * _sync_SlowExit ;

   182   static PerfCounter * _sync_SlowNotify ;

   183   static PerfCounter * _sync_SlowNotifyAll ;

   184   static PerfCounter * _sync_FailedSpins ;

   185   static PerfCounter * _sync_SuccessfulSpins ;

   186   static PerfCounter * _sync_PrivateA ;

   187   static PerfCounter * _sync_PrivateB ;

   188   static PerfCounter * _sync_MonInCirculation ;

   189   static PerfCounter * _sync_MonScavenged ;

   190   static PerfCounter * _sync_Inflations ;

   191   static PerfCounter * _sync_Deflations ;

   192   static PerfLongVariable * _sync_MonExtant ;

   193 

   194  public:

   195   static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;