Nested Mutex

Mentors: Daniel Ramirez, Cyrille Artho, Joel Sherrill, Gedare Bloom, Chris Johns

Participant: Saurabh Gadia

Status Currently working on configuring and designing the nested mutex validation model in JPF environment for proposed solution.

Introduction The strict order mutexes in RTEMS is based on LIFO ordering. So whenever thread tries to acquire mutex lock, its priority before acquiring the lock is pushed to that mutex’s thread queue. So whenever thread release any lock then that lock’s queue is consulted and thread’s priority is restored. So this mechanism of restoring priority may induce unbounded priority inversion if higher priority thread is contending for a lock still hold by our candidate thread. This project deals with solving this problem and developing validation methods using JPF.

Progress

• Proposed solution for the existing problem. You can find presentation which also contains test cases in attachment section.
• Now working on configuring and setting up JPF environment.