A Research On Real-time Performance And Security Of Embedded Operating System

Embedded systems have been widely applied in industry, economy, life and so on.Better real-time performance and security are required in the critical areas that related tothe national security and personal property.As its software core, embedded operating system is the base of the embeddedsystem’s real-time performance and security. This thesis researches on the real-timeperformance and security of embedded systems. The research on the real-timeperformance includes the analysis of factors of real-time performance and the study ofkey factor: real-time scheduling algorithm. In addition, a new modeling framework isgiven to model the scheduling and analysis feasibility, which guarantees the real-timerequirement. The research on security focus on access control technology. The mainworks of this thesis includes:1. Analysis of the factors of real-time performance. This thesis studies the conceptof real-time, and analysis the factors both inside and outside the system, then focus onthe influence of different scheduling algorithms on the real-time performance.2. Based on the research of the current real-time scheduling algorithm, this thesisdesigns and implements a RM scheduler on FreeRTOS, which allows FreeRTOSschedule the periodic tasks with RM scheduling algorithm.3. Based on the research of the scheduling analysis using model checking, thisthesis designs a new modeling framework with request-answer mechanism. With thisframework, this thesis has done the scheduling analysis on RM scheduling algorithmand EDF scheduling algorithm. Compared to other framework, this framework has morescheduling details and better performance.4. Based on the current research of access control, this thesis designs andimplements an access control framework on FreeRTOS, with which different securitystrategies can be applied to the system and promises better security.