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操作系统实验演示代码(三个实验，作业管理，内存管理，文件管理)(Experimental demonstration of the operating system code (three experiments, operations management, memory management, document management))

银行家算法是一种最有代表性的避免死锁的算法。又被称为“资源分配拒绝”法(Bankers algorithm is one of the most representative of the algorithm to avoid deadlock. Also known as "resource allocation denial" method)

重庆大学软件学院操作系统实验二，线程及其调度，实现并行排序，并用图形界面表示(operating system test 2，thread scheduling and realize the parallel sorting showing as a graphical interface)

采用首次适应法、最佳适应法或最差适应法，编写一内存分配和回收模拟程序。 动态地随机产生新的“内存分配”或“内存回收”请求，再按照你选定的分配算法修改这个数组。由于这个实验的重点在于内存分配，所以不考虑与某内存区相关的进程情况。(used first to adapt, adapt best or the worst adaptation law, the preparation of a memory allocation and recovery simulation program. Dynamic random to create a new "memory allocation" or "memory recovery" request, then you have chosen in accordance with the allocation algorithm to change the array. As the focus of this experiment is memory allocation, it is not considered relevant to a certain memory area of the process.)

1、 ：编写并调试一个模拟的进程调度程序，采用“最高优先数优先”调度算法对进程进行调度。 “最高优先数优先调度算法的基本思想是把CPU分配给就绪队列中优先数最高的进程。尝试静态优先数与动态优先数两种方法： a) 静态优先数是指优先数在整个进程运行期间不再改变。优先数可以在数据输入时指定，也可以根据到达顺序、运行时间确定。 b) 动态优先数是指进程的优先数在创建进程时可以给定一个初始值，并且可以按一定原则修改优先数。例如进程获得一次CPU后就将其优先数减少1。或者进程等待的时间超过某一时限时增加其优先数的值。 2、 编写并调试一个模拟的进程调度程序，模拟实现多级反馈队列调度算法。 3、 编写并调试一个模拟的进程调度程序，模拟实现最低松弛度优先算法。 4、 程序与报告要求： a) 对上述要求1、2、3，至少要完成一项，鼓励尝试多种算法。 b) 输出结果要尽量详细清晰，能够反映调度后队列变化，PCB内部变化。 c) 可以选择在Windows或Linux环境下编写、运行程序 d) 鼓励使用不同的开发工具在不同平台环境上进行开发比较。 e) 在实验报告中，一方面可以对实验结果进行分析，一方面可以对各种算法进行比较，分析它们的优劣，说明各种算法适用于哪些情况下的调度。 (1 : Prepare a simulation and debugging process scheduling procedures, "Priority number of the highest priority" to the process of scheduling algorithms for scheduling. "Highest priority priority scheduling algorithm for the basic idea is to place the CPU allocated to the priority queue highest process. Taste Examination several static and dynamic priority priority number two methods : a) static priority number is priority number in operation during the entire process will not change. priority number in the designated input data, can be reached under the order, running time determine. b) dynamic priority number refers to several priorities for the process of the creation process can be given an initial value, and according to the principle of amending certain priority number.)

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.)

说明：  用标准C实现shell功能,是操作系统的作业，Linux里面的she(Shell to achieve using standard C function, the operation is the operating system, Linux inside she)

我的银行家算法，大家来看看。 若要密码 265913(I bankers algorithm, we take a look at. To password 265913)

基于EOS方法位移约束拓扑优化，可以有效的得到最优的结构。(Based on the EOS method, the optimal structure of the displacement constrained topology can be obtained effectively.)

说明：  银行家算法的实现，allocate，need，maximum等矩阵算出request是否安全(banker algorithm)