S7-200CN_Key

Java语言实现nachos系统的基本功能，使用伯克利大学指导书要求。(Java language nachos basic functions of the system, using the instructions Berkeley requirements.)

内存静态分配： 程序还有一些错误，益出处理不知道怎么加入。此程序开始不是我写的的，我在别人的基础上理解并改动了一些。实验课已经结束了，没时间在做了，以后有机会再改。(static memory allocation : there are some procedural error, derived from processing do not know how to join. This is not the beginning of the proceedings I write, I others on the basis of understanding and change some of it. Experiments over, and no time to do in the future will have the opportunity to change.)

时间片轮转法，运行进程用完它的时间片后还未完成，就送到就绪队列队尾(time change once have fishes return to next last)

说明：  华南理工大学操作系统课程设计文件哈哈哈哈哈哈(hua nan li gong da xue cao zuo xi tong ke cheng she ji)

说明：  手机天气预报系统，可以更改城市名字和显示天气，手机symbian 下使用(Mobile weather forecasting system, you can change the city names and display the weather, the use of mobile phones symbian)

弹出框口，精选ios编程学习源码，很好的参考资料。(Pop up box, select learning IOS programming source code, a good reference.)

模拟操作系统的内存调度，硬盘管理，CPU资源分配，进程优先级处理等等(Simulation of memory scheduling, hard disk management, CPU resource allocation, process priority processing and so on)

5s 国行A1528和5C 国行A1526开启移动联通4G运营商文件.（ios9.0~ios9.2.1）(iPhone 5s model A1528 and iPhone 5c model A1526 carrier for opening China mobile&China union 4G.（ios9.0~ios9.2.1）)

页式虚拟存储器的页面置换算法一般有： 最佳置换算法（OPT），先进先出置换算法（FIFO），最近最久未使用置换算法（LRU），Clock置换算法，最少使用置换算法（LFU），页面缓存算法（PBA）等。 先进先出（FIFO）置换算法是最直观的置换算法，由于它可能是性能最差的算法，故实际应用极少。在这里我只使用前面三种算法来进行页面调度(Page replacement algorithms for page virtual memory generally include the best permutation algorithm (OPT), advanced first out permutation (FIFO), the most recent unused replacement algorithm (LRU), Clock permutation algorithm, minimum use of permutation (LFU), and page caching algorithm (PBA). The first in first out (FIFO) replacement algorithm is the most intuitive replacement algorithm, because it may be the worst performing algorithm, so there are few practical applications. Here I only use the first three algorithms for page scheduling.)

说明：  模拟操作系统进程调度(先来先服务，优先级优先，相应比优先，最短作业优先），资源抢夺，内存分配功能（动态分区，静态分区）（最坏适应法，最佳适应法，FIFO）(Simulation operating system process scheduling (first come first serve, priority first, corresponding ratio first, shortest job first), resource grabbing, memory allocation function (dynamic partition, static partition) (worst adaptation, best adaptation, FIFO))