cms-sw/cmssw — pull request #862 by ktf (2013-09-17 12:56:17+00:00)
Title: Thread safety -- Make static variables thread_local in  DetectorDescription/Core to avoid issues when multithreaded.

Not sure this is really needed (@ianna, when is this actually called? beginRun?) however I think that having one copy per thread is simply the right thing to do, since this is static only to save on the initialisation cost, right?