操作系统课程设计：单道系统三种作业调度算法模拟

○1、在数据结构上选择单向链队，即后备作业队列的每个结点表示一个作业块，每个作业块即JCB包含如下信息：作业名，到达时间，所需时间，已运行时间，作业状态，所需主存大小，所需磁带机数目。

○2、提交新作业时，调用函数EnQueue(m_JobName,m_NeedTime)即将作业插入到后备作业队列的末尾。接着判断内存作业队列是否为空，若为空则将后备作业调入内存运行并启动计时器SetTimer(1,1000,NULL),更新列表框控件的信息的显示。

○3、 由于计时器的时间间隔设置为1000毫秒，故每秒钟将调用一次OnTimer(UINT nIDEvent)函数，检查作业的运行状态，若作业的已运行时间大于等于所需时间，则将该作业从内存作业队列中撤销，并处理机依照某一个作业调度算法（FCFS先来先服务，SJF短作业优先，HRN高响应比优先调度算法）进行下一个作业的调度，更新列表框控件的信息显示。

○4、当所有作业都调度完成时，撤销计时器即调用函数KillTimer(1).-Operating System Course Design: Single-channel scheduling algorithm for simulation of three operating systems

○ 1, the data structure select the one-way chain force, the backup job queue of each node represents an operation blocks, each block of the JCB job contains the following information: job name, arrival time, the time has run time , job status, the required size of main memory, the required number of tape drives.

○ 2, submit a new job, call the function EnQueue (m_JobName, m_NeedTime) will work into the back end of the job queue. Then, the job queue to determine whether the memory is empty, if empty will be transferred to the memory backup job to run and start the timer SetTimer (1,1000, NULL), update the list box controls the display of information.

○ 3, set the timer interval to 1000 milliseconds, so the second will be called once OnTimer (UINT nIDEvent) function to check the operational status of jobs, if the job has been running longer than the mean time, it will job q