--- old/src/share/vm/gc/shared/workgroup.cpp	2015-12-17 14:46:40.702305217 -0500
+++ new/src/share/vm/gc/shared/workgroup.cpp	2015-12-17 14:46:40.090270949 -0500
@@ -499,43 +499,3 @@
   }
   return false;
 }
-
-FreeIdSet::FreeIdSet(uint size, Monitor* mon) :
-  _size(size), _mon(mon), _hd(0), _waiters(0), _claimed(0)
-{
-  guarantee(size != 0, "must be");
-  _ids = NEW_C_HEAP_ARRAY(uint, size, mtGC);
-  for (uint i = 0; i < size - 1; i++) {
-    _ids[i] = i+1;
-  }
-  _ids[size-1] = end_of_list; // end of list.
-}
-
-FreeIdSet::~FreeIdSet() {
-  FREE_C_HEAP_ARRAY(uint, _ids);
-}
-
-uint FreeIdSet::claim_par_id() {
-  MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag);
-  while (_hd == end_of_list) {
-    _waiters++;
-    _mon->wait(Mutex::_no_safepoint_check_flag);
-    _waiters--;
-  }
-  uint res = _hd;
-  _hd = _ids[res];
-  _ids[res] = claimed;  // For debugging.
-  _claimed++;
-  return res;
-}
-
-void FreeIdSet::release_par_id(uint id) {
-  MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag);
-  assert(_ids[id] == claimed, "Precondition.");
-  _ids[id] = _hd;
-  _hd = id;
-  _claimed--;
-  if (_waiters > 0) {
-    _mon->notify_all();
-  }
-}