The following fields and methods are currently unused in objectMonitor.hpp, probably a remnant from an older spin lock implementation:

  volatile int _SpinFreq; // Spin 1-out-of-N attempts: success rate
  volatile int _SpinClock;
  volatile intptr_t _SpinState; // MCS/CLH list of spinners

A set of methods defined for use in macroAssembler appear to be unused:

  static int FreeNext_offset_in_bytes() { return offset_of(ObjectMonitor, FreeNext); }
  static int WaitSet_offset_in_bytes() { return offset_of(ObjectMonitor, _WaitSet); }
  static int Responsible_offset_in_bytes() { return offset_of(ObjectMonitor, _Responsible); }
  static int Spinner_offset_in_bytes() { return offset_of(ObjectMonitor, _Spinner); }

Additionally, these methods are declared but not defined:

  int TrySpin_Fixed(Thread * Self);
  int TrySpin_VaryFrequency(Thread * Self);