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, 6 insertions, 1 deletions

diff --git a/cpukit/score/src/schedulerstrongapa.c b/cpukit/score/src/schedulerstrongapa.c
index 5d7c7f7a1d..fc6d0125e7 100644
--- a/cpukit/score/src/schedulerstrongapa.c
+++ b/cpukit/score/src/schedulerstrongapa.c
@@ -183,7 +183,12 @@ void _Scheduler_strong_APA_Node_initialize(
   Scheduler_strong_APA_Node    *the_node;
 
   the_node = _Scheduler_strong_APA_Node_downcast( node );
-  _Scheduler_SMP_Node_initialize( &the_node->Base, the_thread, priority );
+  _Scheduler_SMP_Node_initialize(
+    scheduler,
+    &the_node->Base,
+    the_thread,
+    priority
+  );
 
   context = _Scheduler_Get_context( scheduler );
   self = _Scheduler_strong_APA_Get_self( context );