void DrainStacksCompactionTask::do_it(GCTaskManager* manager, uint which) {
  assert(Universe::heap()->is_gc_active(), "called outside gc");

  NOT_PRODUCT(GCTraceTime tm("DrainStacksCompactionTask",
    PrintGCDetails && TraceParallelOldGCTasks, true, NULL));

  ParCompactionManager* cm =
    ParCompactionManager::gc_thread_compaction_manager(which);

  uint which_stack_index;
  bool use_all_workers = manager->all_workers_active();
  if (use_all_workers) {
    which_stack_index = which;
    assert(manager->active_workers() == ParallelGCThreads,
           err_msg("all_workers_active has been incorrectly set: "
                   " active %d  ParallelGCThreads %d", manager->active_workers(),
                   ParallelGCThreads));
  } else {
    which_stack_index = stack_index();
  }

  cm->set_region_stack(ParCompactionManager::region_list(which_stack_index));
  if (TraceDynamicGCThreads) {
    gclog_or_tty->print_cr("DrainStacksCompactionTask::do_it which = %d "
                           "which_stack_index = %d/empty(%d) "
                           "use all workers %d",
                           which, which_stack_index,
                           cm->region_stack()->is_empty(),
                           use_all_workers);
  }

  cm->set_region_stack_index(which_stack_index);

  // Process any regions already in the compaction managers stacks.
  cm->drain_region_stacks();

  assert(cm->region_stack()->is_empty(), "Not empty");

  if (!use_all_workers) {
    // Always give up the region stack.
    assert(cm->region_stack() ==
           ParCompactionManager::region_list(cm->region_stack_index()),
           "region_stack and region_stack_index are inconsistent");
    ParCompactionManager::push_recycled_stack_index(cm->region_stack_index());

    if (TraceDynamicGCThreads) {
      void* old_region_stack = (void*) cm->region_stack();
      int old_region_stack_index = cm->region_stack_index();
      gclog_or_tty->print_cr("Pushing region stack 0x%x/%d",
        old_region_stack, old_region_stack_index);
    }

    cm->set_region_stack(NULL);
    cm->set_region_stack_index((uint)max_uintx);
  }
}
Example #2
0
		decltype(auto) get() const {
			return stack::get<T>(L, stack_index());
		}