用IBM-PC机进行实时多任务处理时解决DOS不可重入的方法

How to Solve the Irreaccessibility of PC-DOS,by Using IBM-PC for Real-time Muti-task Handling

使用IBM-PC机进行实时多任务处理时,常常会遇到锁机问题。尤其是用PC机做为工业过程的DCS实时多任务控制系统时,往往是失败的,这是因为PC-DOS 不可重入所致。本文在分析DOS 不可重入原因的基础上,提出了一个简便的解决方法,并通过一个实例说明了用PC 机进行实时多任务处理的实现方法。

It is more often than not that “deadlock” would take placewhen an IBM-PC is used for real-time multi-task handling.It would especi-ally be a failurc if the PC is to serve as a field aperation station for DCSreal-time control system,because the PC-DOS is irreaccessible.In this papera simple and handy method to solve this problem has been proposed basedupon a thorough analysis of crux of irreaccssiblity of PC-DOS,illustratedwith a casestudy as to how to materialize multi-task handling properly bymeans of a PC.