Method update

src/db/db/dbLayout.cc:2012–2032

}

void 
Layout::update () const
{
  //  NOTE: this is double checking - which is not inherently thread-safe.
  //  However, it's so much faster, and the deal is to start multithreaded
  //  reads with an already-updated layout and not to do reading from one thread
  //  while writing from another. So it's worth the risk.
  if (! (hier_dirty () || bboxes_dirty () || prop_ids_dirty ())) {
    return;
  }

  tl::MutexLocker locker (&lock ());

  //  We do double checking here as another thread might do the update as well.
  //  Checking "under_constrcution" will also prevent recursion in "update".
  if (under_construction () || ! (hier_dirty () || bboxes_dirty () || prop_ids_dirty ())) {
    return;
  }

  force_update_no_lock ();
}

bool
Layout::update_needed () const