LP_MPSAFE
l->l_pflag &= ~LP_MPSAFE;
if ((l->l_pflag & LP_MPSAFE) == 0) {
if (__predict_false((new_lwp->l_pflag & LP_MPSAFE) == 0)) {
l2->l_pflag = LP_MPSAFE;
l->l_pflag |= LP_MPSAFE;
if ((curlwp->l_pflag & LP_MPSAFE) == 0)
if ((curlwp->l_pflag & LP_MPSAFE) == 0)