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score: Multiprocessor Resource Sharing Protocol

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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.
This commit is contained in:
Sebastian Huber
2014-05-28 10:50:41 +02:00
parent 9f058fb1c2
commit 8fcafdd553
32 changed files with 2251 additions and 16 deletions
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cpukit/sapi/include/confdefs.h
+13 -1
View File
@@ -1792,6 +1792,17 @@ const rtems_libio_helper rtems_fs_init_helper =
CONFIGURE_SEMAPHORES_FOR_FILE_SYSTEMS + \
CONFIGURE_NETWORKING_SEMAPHORES)
#if !defined(RTEMS_SMP) || \
!defined(CONFIGURE_MAXIMUM_MRSP_SEMAPHORES)
#define CONFIGURE_MEMORY_FOR_MRSP_SEMAPHORES 0
#else
#define CONFIGURE_MEMORY_FOR_MRSP_SEMAPHORES \
CONFIGURE_MAXIMUM_MRSP_SEMAPHORES * \
_Configure_From_workspace( \
RTEMS_ARRAY_SIZE(_Scheduler_Table) * sizeof(Priority_Control) \
)
#endif
/*
* If there are no user or support semaphores defined, then we can assume
* that no memory need be allocated at all for semaphores.
@@ -1800,7 +1811,8 @@ const rtems_libio_helper rtems_fs_init_helper =
#define CONFIGURE_MEMORY_FOR_SEMAPHORES(_semaphores) 0
#else
#define CONFIGURE_MEMORY_FOR_SEMAPHORES(_semaphores) \
_Configure_Object_RAM(_semaphores, sizeof(Semaphore_Control) )
_Configure_Object_RAM(_semaphores, sizeof(Semaphore_Control) ) + \
CONFIGURE_MEMORY_FOR_MRSP_SEMAPHORES
#endif
#ifndef CONFIGURE_MAXIMUM_MESSAGE_QUEUES