an execution overrun management mechanism for the temporal robustness of java real-time systems
This paper presents a mechanism for execution-overrun management in real-time systems. Based on fault prevention, we determine the Latest Execution Time ( LET ) of a task defined as the latest absolute time a faulty task can proceed with its execution without compromising the real-time constraints of all the tasks in the system. This mechanism enables to cope with execution overruns before a deadline miss. LET use the allowance notion which depends on free CPU resources. We show how to determine the LET based on existing real-time feasibility conditions for fixed scheduling FP/HPF. We then integrate the LET in an existing RTSJ compliant system and analyze its performances.
temporal robustness let allowance feasibility conditions wcet fixed priority scheduling real-time java specification