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, 12 insertions, 8 deletions

diff --git a/cpukit/score/src/schedulerdefaultreleasejob.c b/cpukit/score/src/schedulerdefaultreleasejob.c
index 7272fc1946..490d58b05f 100644
--- a/cpukit/score/src/schedulerdefaultreleasejob.c
+++ b/cpukit/score/src/schedulerdefaultreleasejob.c
@@ -21,26 +21,30 @@
 
 #include <rtems/score/scheduler.h>
 
-Thread_Control *_Scheduler_default_Release_job(
+void _Scheduler_default_Release_job(
   const Scheduler_Control *scheduler,
   Thread_Control          *the_thread,
-  uint64_t                 deadline
+  Priority_Node           *priority_node,
+  uint64_t                 deadline,
+  Thread_queue_Context    *queue_context
 )
 {
   (void) scheduler;
   (void) the_thread;
+  (void) priority_node;
   (void) deadline;
-
-  return NULL;
+  (void) queue_context;
 }
 
-Thread_Control *_Scheduler_default_Cancel_job(
+void _Scheduler_default_Cancel_job(
   const Scheduler_Control *scheduler,
-  Thread_Control          *the_thread
+  Thread_Control          *the_thread,
+  Priority_Node           *priority_node,
+  Thread_queue_Context    *queue_context
 )
 {
   (void) scheduler;
   (void) the_thread;
-
-  return NULL;
+  (void) priority_node;
+  (void) queue_context;
 }