30 BarrierSet* BarrierSet::_bs = NULL;

    31 BarrierSet* BarrierSet::_barrier_set = NULL;

    32 

    33 void BarrierSet::set_barrier_set(BarrierSet* barrier_set) {

    34   assert(_barrier_set == NULL, "Already initialized");

    35   _barrier_set = barrier_set;

    36 

    37   // The barrier set was not initialized when the this thread (the main thread)

    38   // was created, so the call to BarrierSet::on_thread_create() had to be deferred

    39   // until we have a barrier set. Now we have a barrier set, so we make the call.

    40   _barrier_set->on_thread_create(Thread::current());

    41 }