score: Rework thread priority management

Add priority nodes which contribute to the overall thread priority.

The actual priority of a thread is now an aggregation of priority nodes.
The thread priority aggregation for the home scheduler instance of a
thread consists of at least one priority node, which is normally the
real priority of the thread.  The locking protocols (e.g. priority
ceiling and priority inheritance), rate-monotonic period objects and the
POSIX sporadic server add, change and remove priority nodes.

A thread changes its priority now immediately, e.g. priority changes are
not deferred until the thread releases its last resource.

Replace the _Thread_Change_priority() function with

 * _Thread_Priority_perform_actions(),
 * _Thread_Priority_add(),
 * _Thread_Priority_remove(),
 * _Thread_Priority_change(), and
 * _Thread_Priority_update().

Update #2412.
Update #2556.

1 files changed, 1 insertions, 1 deletions

diff --git a/cpukit/posix/src/pthreadgetschedparam.c b/cpukit/posix/src/pthreadgetschedparam.c
index 38e0b4f9b5..1d4812c067 100644
--- a/cpukit/posix/src/pthreadgetschedparam.c
+++ b/cpukit/posix/src/pthreadgetschedparam.c
@@ -59,7 +59,7 @@ int pthread_getschedparam(
   *param  = api->Attributes.schedparam;
 
   scheduler = _Scheduler_Get_own( the_thread );
-  priority = the_thread->real_priority;
+  priority = the_thread->Real_priority.priority;
 
   _Thread_Wait_release( the_thread, &queue_context );