thunk_makecontext
thunk_makecontext(&sc->sc_ucp, (void (*)(void)) cpu_switchto_atomic,
thunk_makecontext(ucp, (void (*)(void)) func, 1, arg, NULL, NULL, NULL);
thunk_makecontext(&pcb2->pcb_ucp,
void thunk_makecontext(ucontext_t *ucp, void (*func)(void),
thunk_makecontext(ucp, (void *) pack->ep_entry,
thunk_makecontext(&jump_ucp,