INVALID_QTID       20 gc/specific.c  static tse invalid_tse = {INVALID_QTID, 0, 0, INVALID_THREADID};
INVALID_QTID       57 gc/specific.c      GC_ASSERT(entry -> qtid == INVALID_QTID);
INVALID_QTID       81 gc/specific.c          entry -> qtid = INVALID_QTID;
INVALID_QTID      111 gc/specific.c      GC_ASSERT(qtid != INVALID_QTID);