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1.? Write vulnerability program5、三会包青天 5集 柳叶琴－郭淑贤HorseAbout a week (mail speed is uncontrollable, please go to the scene for urgent use)D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:In TCP protocol, messages arriving at the destination will enter the buffer of the TCP stack and will not be forwarded to the receiving system until the buffer is full. This is to minimize the number of times the system empties the buffer. However, the sender can force the receiving system to clear the contents of the buffer by sending a TCP message with a PSH flag of 1. The TCP PUSH + ACK attack, like the TCP SYN attack, aims to deplete the resources of the victim system. When an attacker sends TCP messages with PSH and ACK flags set to 1 to the Target host, these messages will cause the Target system to clear all TCP buffers (whether the buffers are full or not) and respond with an acknowledgement message. If this process is performed by a large number of controlled hosts, the system will not be able to process normal data, resulting in denial of service.该剧由零客创享（北京）影视传媒有限公司、北京辉煌六合影视传媒有限公司联合出品，非比寻常影视文化（北京）有限公司独家发行，搜狐视频上映。主要讲述了七零后怪蜀黍何毕热衷于各种奇葩发明，这天他拿着一款名叫“断片修复仪”的新发明到酒吧寻找测试对象，遇到烂醉如泥的李莎拉。原来九零后非主流脑残妹 李莎拉的富二代男友劈腿其闺蜜，李莎拉与男友大吵一架并分手，一个人到酒吧买醉。何毕不忍看李莎拉醉酒流落街头，把她带回家，谁知带回来的竟是甩不掉的“狗皮膏药”，于是两人爆笑又温情的同居生活开始了......