tfind_user
p = tid ? tfind_user(tid, curp->p_p) : curp;
p = tid ? tfind_user(tid, curp->p_p) : curp;
p = tid ? tfind_user(tid, cp->p_p) : cp;
q = tfind_user(__CLOCK_PTID(clock_id), p->p_p);
q = tfind_user(__CLOCK_PTID(clock_id), p->p_p);
t = tfind_user(pts->pts_tid, tr);
struct proc *tfind_user(pid_t, struct process *);