In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).
奥拜隆少将及其秘密突击队发现在太平洋的巴拉罗亚岛上， 一种致命辐射正在破坏大气臭氧层，令全球气温迅速上升至危险水平！而他们不知道的是, 这一切竟然是一班原始外星人要毁灭地球的阴谋！奥拜隆少将一方面要带领步队应付岛上的野蛮土著，另一方面更要阻止那群凶悍的外星人继续侵害地球……
II. What is the demand for content consumption
为了保住村民的救命粮食，武僧决定与山贼一战，由此展开了一场秋收保卫战。
刘黑子立即让人去找太太，拿了春花的卖身契还给她，也没打骂，直接赶回家了。
方家老大任剑辉（黄百鸣饰）是一名烹饪主持人，成熟稳重的他对两名弟弟多般照顾，因此到三十岁都没有女朋友；老二任剑郎（周润发饰）是个娘娘腔的花花公子，纵使有空姐女友天红（郑裕玲饰），但他仍周旋与众多女友之间，后来更认识美艳的Beautiful（钟楚红饰）后引发了一段感情纠纷，郎最终还是浪子回头；小弟方剑笙（张学友饰）是个单纯害羞的漫画家，偶然遇上了活泼少女莹莹（袁洁莹饰）后发展了一段纯洁的爱情。一次偶然的电话故障，也让任剑辉认识离婚妇人吴芬芳（冯宝宝饰），两人发展顺利，但却因为帮忙弟弟剑郎掩盖风流债，让芬芳误以为剑辉是个勾三搭四的人，众人决定帮剑辉挽回即将失去的爱情……
但严党要报复的却是先生。
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:
因此缘故，他的胆气和勇气都非比寻常，跟着又补充道：除了张家玉米是谁的儿子不能说。
克利夫(斯蒂夫·赞恩饰)和西德妮(米拉·乔沃维奇饰)这对极度热爱冒险的新婚夫妇，为了能让自己的蜜月期都变得冒险味儿十足，两人决定背起行囊到景色宜人的夏威夷岛附近的海滩和丛林来一次探险蜜月旅行。在经过精心的准备之后，两人踏上了“野性十足”的海岛冒险旅程。巧合的是，两人无论是乘直升机刚刚赶到小岛，还是在小岛的丛林中驱车前行，总能与同样是一对年轻的情侣遭遇。于是，在简单的寒暄之后，尼克(蒂摩西·奥利芬特饰)和吉娜(凯尔·桑切斯饰)加入到一起，组成一个四人探险小队，一同完成他们想要的蜜月探险。
The reason is, first, its durability needs to be repaired by 800 ~ ~ ~, which can fully meet our needs.
In fact, the most useful thing about the threshold is the discussion about the shooting speed. The most important thing is the assassin's assassination and Li Ang's various skills. The reason why Li Ang took the flying soldiers was also because of the theory of shooting speed, which led to the strength of Li Ang's mixed arms.
作为老师的姜大雁（宋佳 饰）各方面条件都不错，可三十四岁了，依然孓身一人。大雁的婚姻一直没有着落成了姜家上下万分操心的问题。于是各种相亲和朋友介绍接踵而来。为了配合家人的好意，大雁参加了形形色色的相亲，见识了各色各样的人。在人海之中，也不是没有遇到合适的。遇到了一个各方面都还不错的公务员方泉（郭涛 饰）。本想进一步接触看看，可人家目的明确是为了更好的发展而选择结婚；弟媳这边的上司彭坦（周杰 饰）各方面条件都很好，为人也幽默风趣，但其母则严厉苛刻，于是也不了了之；电台主持人苏如是（刘德凯 饰）是大雁所教学生的家长，颇具成熟男人的魅力，很是吸引大雁。但为了女儿，苏如是还是选择了和前妻复合。大雁也只能无奈放手。
中国的抗日战争进入到最艰苦的阶段,缅甸沦陷,日军侵犯云南的畹町,龙陵,腾冲,滇缅公路被迫中断,由此,最后一条通往中国战区的通道也被切断,使外国援华的物资无法从缅甸运入中国……
张辛辛虽然对马杰很凶很泼辣，但却是雷打不动的爱情，两人在争吵中过着属于他们自己的幸福生活，虽然中途有摩擦和表现的出轨预兆，但都能及时的制止住。
菲律宾导演Lav Diaz接近4小时的复仇史诗，讲述一位女性在坐了30年的冤狱后终于被证清白。然而好不容易出狱后，她才惊觉原来将她送进监狱的就是上流社会的爱人。随着菲律宾进入转型社会，仇富济贫的绑架犯罪开始冒头，女主角也趁机策划起她的报复行动。
那不会是被鱼雷袭击了吧？下铺想到了几乎唯一一种可能。
