thr_keycreate
if (thr_keycreate(&arc4random_global.thread_key,
thr_keycreate(&_gmonkey, _m_gmon_destructor);
thr_keycreate(&rpc_call_key, rpc_call_destroy);
thr_keycreate(&nc_key, free);
thr_keycreate(&rce_key, free);
thr_keycreate(&tcp_key, free);
thr_keycreate(&udp_key, free);
thr_keycreate(&clnt_broadcast_key, free);
thr_keycreate(&fdsetkey, svc_fdset_free);
thr_keycreate(&strerror_key, free);