RTEMS | SMP: Add support for the MPCP locking protocol (!1358)

[Ivy Zhuang (@purple-affogato)]

Ivy Zhuang commented on a discussion on cpukit/include/rtems/rtems/sem.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1358#note_155061

 >   * @param attribute_set is the attribute set of the semaphore.
 >   *
 >   * @param priority_ceiling is the priority ceiling if the semaphore is a binary
 > - *   semaphore with the priority ceiling or MrsP locking protocol as defined by
 > - *   the attribute set.
 > + *   semaphore with the priority ceiling, MrsP, or MPCP locking protocol as

For this case, perhaps a good option is "the priority ceiling locking protocol or one of its multiprocessor variants", since not all multiprocessor locking protocols use a priority ceiling :thinking:

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1358#note_155061
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