基于任务链的实时多任务软件可靠性建模

提出了以实时多任务系统中的任务链为组件，任务链运行时间比例作为组件的权重系数，建立实时多任务软件的可靠性建模方法。该方法符合实时多任务系统应用软件运行的实时情况，拓展了实时系统可靠性建模的思路，其可靠性模型可以给出单个任务链的可靠性参数，且建模方法还可以根据不同任务链的重要程度，进行可靠性分配并决定软件测试和投放时间。
关 键 词 实时系统; 多任务; 任务链; 可靠性模型

Abstract Taking lansaction as component in real-time multi-task system, and executeing time rate as the quotiety of lansaction, the paper present a method of reliability modeling based on lansaction for real-time multi-task software. The method tally with the actual situation of programm executing of real-time multi-task. The model can submit evaluation results of single lansaction, so, the reliability modeling is convenient for reliability assigning and determine test time according to importance of the lansaction.
Key words real-time system; multitasking; lansaction; reliability modeling