413 

   414 ZThreadRootsIterator::ZThreadRootsIterator() :

   415     _threads(this) {

   416   assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint");

   417   ZStatTimer timer(ZSubPhasePauseRootsSetup);

   418   Threads::change_thread_claim_token();

   419 }

   420 

   421 ZThreadRootsIterator::~ZThreadRootsIterator() {

   422   ZStatTimer timer(ZSubPhasePauseRootsTeardown);

   423   Threads::assert_all_threads_claimed();

   424 }

   425 

   426 void ZThreadRootsIterator::do_threads(ZRootsIteratorClosure* cl) {

   427   ZStatTimer timer(ZSubPhasePauseRootsThreads);

   428   ResourceMark rm;

   429   Threads::possibly_parallel_oops_do(true, cl, NULL);

   430 }

   431 

   432 void ZThreadRootsIterator::oops_do(ZRootsIteratorClosure* cl) {

   433   ZStatTimer timer(ZSubPhasePauseRoots);

   434   _threads.oops_do(cl);

   435 }