tasks_nocpu_error
nocpu = tasks_nocpu_error(parent, cs, xcpus);
if (tasks_nocpu_error(parent, cs, xcpus))
nocpu |= tasks_nocpu_error(parent, cs, newmask);
if (tasks_nocpu_error(parent, cs, trialcs->effective_xcpus))
tasks_nocpu_error(parent, cs, &new_cpus) ||