Symbol: LWP_VFORK
sys/kern/kern_fork.c
495
lwp_create(l1, p2, uaddr, (flags & FORK_PPWAIT) ? LWP_VFORK : 0,
sys/kern/kern_lwp.c
863
l2->l_boostpri = ((flags & LWP_VFORK) ? PRI_KERNEL : PRI_USER);
sys/kern/kern_lwp.c
878
if (flags & LWP_VFORK && l1->l_lwpctl) {