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, 3 deletions

diff --git a/cpukit/score/src/threadqflush.c b/cpukit/score/src/threadqflush.c
index fb1323073d..9ea82af24a 100644
--- a/cpukit/score/src/threadqflush.c
+++ b/cpukit/score/src/threadqflush.c
@@ -99,8 +99,11 @@ size_t _Thread_queue_Flush_critical(
     if ( do_unblock ) {
       Scheduler_Node *scheduler_node;
 
-      scheduler_node = _Scheduler_Thread_get_own_node( first );
-      _Chain_Append_unprotected( &unblock, &scheduler_node->Wait.Node.Chain );
+      scheduler_node = _Thread_Scheduler_get_own_node( first );
+      _Chain_Append_unprotected(
+        &unblock,
+        &scheduler_node->Wait.Priority.Node.Node.Chain
+      );
     }
 
     ++flushed;
@@ -123,7 +126,7 @@ size_t _Thread_queue_Flush_critical(
       Chain_Node     *next;
 
       next = _Chain_Next( node );
-      scheduler_node = SCHEDULER_NODE_OF_WAIT_CHAIN_NODE( node );
+      scheduler_node = SCHEDULER_NODE_OF_WAIT_PRIORITY_NODE( node );
       the_thread = _Scheduler_Node_get_owner( scheduler_node );
       _Thread_Remove_timer_and_unblock( the_thread, queue );