Analysis and Solution of Realtime Satellite Service Task Blocking Problem Caused by Resource Access Control Flaw

This paper delineates a real-time satellite task blocking problem stemming from flaws in the access control logic within the mutex semaphore acquisition function of an onboard real-time operating system. These flaws result in abnormal modification of mutex semaphore ownership, causing certain onboard real-time data processing task to abnormally halt execution. Through analysis of the system's real-time task scheduling mechanism and problematic data, the root cause of the problem is pinpointed, and a straightforward and effective resolution is proposed. Ultimately, the validation process and outcomes of this method are presented.