_lwp_kill
int _lwp_kill(lwpid_t, int);
return _lwp_kill(_lwp_self(), s);
if (_lwp_kill(newthread->pt_lid, 0) == -1 &&
if (_lwp_kill(thread->pt_lid, sig))
RL(_lwp_kill(lwp_data[0].threadid, SIGUSR1));