FSHOW((stderr,"/creating thread %lu\n", thread_self()));
check_deferrables_blocked_or_lose(0);
check_gc_signals_unblocked_or_lose(0);
FSHOW((stderr,"/creating thread %lu\n", thread_self()));
check_deferrables_blocked_or_lose(0);
check_gc_signals_unblocked_or_lose(0);