hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp

rev 6888 : 8064556: G1: ParallelGCThreads=0 may cause assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current())) failed: Should be empty
Reviewed-by: mgerdin, tschatzl

*** 5226,5236 ****
        _code_cache_task(num_workers, is_alive, unloading_occurred),
        _klass_cleaning_task(is_alive) {
    }
  
    void pre_work_verification() {
!     assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
    }
  
    void post_work_verification() {
      assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
    }
--- 5226,5238 ----
        _code_cache_task(num_workers, is_alive, unloading_occurred),
        _klass_cleaning_task(is_alive) {
    }
  
    void pre_work_verification() {
!     // The VM Thread will have registered Metadata during the single-threaded phase of MetadataStackOnMark.
!     assert(Thread::current()->is_VM_thread()
!            || !MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
    }
  
    void post_work_verification() {
      assert(!MetadataOnStackMark::has_buffer_for_thread(Thread::current()), "Should be empty");
    }