forked from Imagelibrary/rtems
8fcafdd553
Add basic support for the Multiprocessor Resource Sharing Protocol (MrsP). The Multiprocessor Resource Sharing Protocol (MrsP) is defined in A. Burns and A.J. Wellings, A Schedulability Compatible Multiprocessor Resource Sharing Protocol - MrsP, Proceedings of the 25th Euromicro Conference on Real-Time Systems (ECRTS 2013), July 2013. It is a generalization of the Priority Ceiling Protocol to SMP systems. Each MrsP semaphore uses a ceiling priority per scheduler instance. These ceiling priorities can be specified with rtems_semaphore_set_priority(). A task obtaining or owning a MrsP semaphore will execute with the ceiling priority for its scheduler instance as specified by the MrsP semaphore object. Tasks waiting to get ownership of a MrsP semaphore will not relinquish the processor voluntarily. In case the owner of a MrsP semaphore gets preempted it can ask all tasks waiting for this semaphore to help out and temporarily borrow the right to execute on one of their assigned processors. The help out feature is not implemented with this patch.
# # COPYRIGHT (c) 1989-2011. # On-Line Applications Research Corporation (OAR). # # The license and distribution terms for this file may be # found in the file LICENSE in this distribution or at # http://www.rtems.org/license/LICENSE. This directory contains the RTEMS SMP Test Suite. As of June 2011, these tests are known to run on only + pcp4 BSP using qemu with 2-4 cores + leon3 BSP using grsim with 4 cores