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For example, in Java, the Selector's select () method is used to implement this synchronous blocking operation waiting for an event to occur. In the implementation of select () under Linux operating system, a) will call epollCtl (epfd, opcode, fd, events) to register the events that have been registered in Initiation Dispatcher into Linux system, where fd means Handle and events means Handle events that we are interested in; B) Synchronize the occurrence of a blocked wait registered event by calling the epollWait method. Events on different event sources may occur at the same time. Once an event is triggered, the epollWait method will return. C) Finally, find the associated SelectorKeyImpl object by the event that occurred, set the event that occurred to the ready state, and then put the SelectorKeyImpl into the selectedSet. In this way, we can get the event-ready SelectorKeyImpl collection through the Selector.selectedKeys () method.China's Battlefield: A total of 1.48 million Chinese troops died and 440,000 Japanese troops died, with a death ratio of about 3.36: 1 on both sides."Liu Guiduo is very shrewd and more mature than us..."Where will you go is not as emotional as in Korean dramas. It is cold and hard. Because some traditional taboos are deliberately avoided.被自己哥哥公孙杰护在手掌心长大的可唯，除了娇俏可爱的外表，开朗大度又温柔善良的个性，总是能让身边的男孩子们为她所深深吸引，偏偏可唯对爱情的感受极为迟钝，让身边几个追求者——欧阳、上官、司马的明示、暗示都没有被接收到。再加上一个守可唯守得死紧，跟岳父没两样的哥哥公孙杰，几个男孩的恋爱之路是可预见的艰辛长途，而整个故事就是这么开始的！当时，所有人都认为爱丽丝拜入太极门下，不过是一时兴起，一时好玩。From her position, it can also be shown that her IQ is average. She has worked for eight years, but she is still an ordinary employee. The supervisor has not mixed up. Obviously, the office is greasy.