第- 81 -页 ④部分地分配（partial allocation）或循环等待（circular waiting）：存在一个两个或都个进程的循环链， 链中每一个进程等待被链中下一个进程占有的资源。
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circular waiting protocol 循环等待协议
If multiple arrows show a circular lock-request pattern — threads prevent each other from running because they are waiting for each other to release a lock — then you have a deadlock.
如果多个箭头显示一个环形的锁请求模式—由于它们正在相互等候其它线程释放锁，所以线程彼此阻止运行—结果就形成了一个死锁。
Circular buffer benefits are: to make a thread of Shared resources to minimize the waiting time, make them the same as the average operating speed.
循环缓冲区好处是：使共享资源的线程的等待时间减到最小，并使他们的平均操作速度相同。
Shanghai south railway station is a new important transportation center with an open waiting room and a circular layout.
上海铁路南站是上海新建的重要交通枢纽，是第一座采用开敞式候车空间、采用圆形平面布置的火车站。
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