linux.conf.au, January 2003
      PROGRAMMING: kernel/sched.c

 	/*
 	 * Adding/removing a task to/from a priority array:
 	 */
 	static inline void dequeue_task(struct task_struct *p, prio_array_t *array)
 	{
 		array->nr_active--;
 		list_del(&p->run_list);
 		if (list_empty(array->queue + p->prio))
 			__clear_bit(p->prio, array->bitmap);
 	}
 	
 	static inline void enqueue_task(struct task_struct *p, prio_array_t *array)
 	{
 		list_add_tail(&p->run_list, array->queue + p->prio);
 		__set_bit(p->prio, array->bitmap);
 		array->nr_active++;
 		p->array = array;
 	}