TASKLET_STATE_RUN
return test_bit(TASKLET_STATE_RUN, &t->state);
return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
clear_and_wake_up_bit(TASKLET_STATE_RUN, &t->state);
wait_on_bit(&t->state, TASKLET_STATE_RUN, TASK_UNINTERRUPTIBLE);
while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {