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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-21 10:33:43 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-28 10:50:41 +0200 |
| commit | 8fcafdd553f3a564ecb5ab5093d01b29971418da (patch) | |
| tree | 7807b3a4ae28e62f0218f8e20051b1b7e0143206 /cpukit/rtems/include/rtems/rtems/attr.h | |
| parent | bsps/sparc: Change tabs to spaces. (diff) | |
| download | rtems-8fcafdd553f3a564ecb5ab5093d01b29971418da.tar.bz2 | |
score: Multiprocessor Resource Sharing Protocol
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.
Diffstat (limited to 'cpukit/rtems/include/rtems/rtems/attr.h')
| -rw-r--r-- | cpukit/rtems/include/rtems/rtems/attr.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/cpukit/rtems/include/rtems/rtems/attr.h b/cpukit/rtems/include/rtems/rtems/attr.h index d326539714..7e8fa4818a 100644 --- a/cpukit/rtems/include/rtems/rtems/attr.h +++ b/cpukit/rtems/include/rtems/rtems/attr.h @@ -139,6 +139,20 @@ typedef uint32_t rtems_attribute; */ #define RTEMS_PRIORITY_CEILING 0x00000080 +/** + * This attribute constant indicates that the Classic API Semaphore instance + * created will NOT use the Multiprocessor Resource Sharing Protocol. + */ +#define RTEMS_NO_MULTIPROCESSOR_RESOURCE_SHARING 0x00000000 + +/** + * This attribute constant indicates that the Classic API Semaphore instance + * created will use the Multiprocessor Resource Sharing Protocol. + * + * @note The semaphore instance must be a binary semaphore. + */ +#define RTEMS_MULTIPROCESSOR_RESOURCE_SHARING 0x00000100 + /******************** RTEMS Barrier Specific Attributes ********************/ /** |