2313   nmethod* cur = _oops_do_mark_nmethods;

  2313   nmethod* cur = _oops_do_mark_nmethods;

  2314   while (cur != NMETHOD_SENTINEL) {

  2314   while (cur != NMETHOD_SENTINEL) {

  2315     assert(cur != NULL, "not NULL-terminated");

  2315     assert(cur != NULL, "not NULL-terminated");

  2316     nmethod* next = cur->_oops_do_mark_link;

  2316     nmethod* next = cur->_oops_do_mark_link;

  2317     cur->_oops_do_mark_link = NULL;

  2317     cur->_oops_do_mark_link = NULL;

  2319     NOT_PRODUCT(if (TraceScavenge)  cur->print_on(tty, "oops_do, unmark"));

  2319     NOT_PRODUCT(if (TraceScavenge)  cur->print_on(tty, "oops_do, unmark"));

  2320     cur = next;

  2320     cur = next;

  2321   }

  2321   }

  2322   void* required = _oops_do_mark_nmethods;

  2322   void* required = _oops_do_mark_nmethods;

  2323   void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);

  2323   void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required);