Description: 看看ARM菜鸟在ARM7上写的操作系统——ARM圈圈操作系统
最近在ADuC7027上写了一个ARM_00_OS，头都写晕了，发上来给大家一起来看看。
任务按优先级调度，如果处于就绪态且优先级最高的任务有两个或更多，则按时间片轮循调度。
支持任务创建、任务删除、内存分配、简单的消息、简单的设备管理、CPU及内存等使用统计等功能。
任务可处于ARM模式或THUMB模式，在创建任务时，要指定任务所处于的模式。
从这里下载整个文件包：http://blog.21ic.com/more.asp?name=computer00&id=16341
-look at birdie in ARM ARM7 written in the operating system-- the operating system ARM circle recently in ADu C7027 write a ARM_00_OS, write head dizzy, deputy undersecretary for everyone to see. Tasks according to priority scheduling, in place if the state but the highest priority tasks of two or more, according to the time-Round Robin scheduling. Support mission to create, delete tasks, memory allocation, the simple information, a simple device management, CPU and memory usage statistics capabilities. At tasks THUMB ARM model or models in the creation mandate, the mandate should be designated at a model. From here to download the whole package : http :// blog.21ic.com/more.asp name = computer00 Platform: |
Size: 360448 |
Author:Computer00 |
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Description: UCOS-III中支持了时间片的轮转调度，为了减少关中断的时间，
内核在对临界段的处理上使用了一些方法，比如为防止中断中访问
临界段代码，把中断的事情分两步来做，即中断中把对内核的操作
仅做保存，实际的操作推迟到一个称为OS_IntQTask中完成！这样
就可以在程序中使用禁止调度的方式来处理临界段的代码，也大大
减少了关中断的时间！但这并不意味着这种方法就是最优了，它是在
任务切换的消耗和关中断的时间来平衡的，所以UCOS-III也支持使用
关中断的方法！ -UCOS-III in support of a time slice of the round-robin scheduling, in order to reduce the interrupt off time, the kernel in the handling of the critical section using a number of methods, such as to prevent interruption in access to critical sections of the code, to break things in two steps do, that is to interrupt the operation of the kernel to do only save the actual operating postponed to a called OS_IntQTask done! This procedure can be used in a way against scheduling critical sections of code to deal with, but also greatly reduces the time to break off! But this does not mean that this method is optimal, and it is consumed in the task switching and interrupt time off to balance, so UCOS-III also supports the use of off interrupt method! Platform: |
Size: 7110656 |
Author:比斌 |
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