设计程序实现N只筷子的有效分配，使用的限制条件为仅当哲学家的左右两只筷子均可用时，才允许他拿起筷子进餐。-Design process to achieve efficient allocation of N only chopsticks, the use restrictions for the left and right only when the philosopher with two chopsticks are available only when allowed him to pick up the chopsticks.