实时嵌入式系统的特征 State Transitions input outputs events Intrinsically state-based transition function ·持续不断地响应外部事件，进行状态转移 current next state state 。Real Time state 正确性依赖于完成的时间 Failure to meet deadlines might create safety issues or simply unhappy customers Exceptions ·Interrupt handling is crucial,某些事件需要即时相应 Concurrency Both Task-level and Statement-level concurrency llxx@ustc.edu.cn 3/112实时嵌入式系统的特征 • State Transitions – Intrinsically state-based • 持续不断地响应外部事件，进行状态转移 • Real Time – 正确性依赖于完成的时间 llxx@ustc.edu.cn 3/112 • Failure to meet deadlines might create safety issues or simply unhappy customers – Exceptions • Interrupt handling is crucial，某些事件需要即时相应 • Concurrency – Both Task-level and Statement-level concurrency