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, 20 insertions, 8 deletions

diff --git a/cpukit/score/include/rtems/score/scheduler.h b/cpukit/score/include/rtems/score/scheduler.h
index bbb4e37240..b934269188 100644
--- a/cpukit/score/include/rtems/score/scheduler.h
+++ b/cpukit/score/include/rtems/score/scheduler.h
@@ -135,16 +135,20 @@ typedef struct {
   void ( *node_destroy )( const Scheduler_Control *, Scheduler_Node * );
 
   /** @see _Scheduler_Release_job() */
-  Thread_Control *( *release_job ) (
+  void ( *release_job ) (
     const Scheduler_Control *,
     Thread_Control *,
-    uint64_t
+    Priority_Node *,
+    uint64_t,
+    Thread_queue_Context *
   );
 
   /** @see _Scheduler_Cancel_job() */
-  Thread_Control *( *cancel_job ) (
+  void ( *cancel_job ) (
     const Scheduler_Control *,
-    Thread_Control *
+    Thread_Control *,
+    Priority_Node *,
+    Thread_queue_Context *
   );
 
   /** @see _Scheduler_Tick() */
@@ -373,14 +377,18 @@ void _Scheduler_default_Node_destroy(
  *
  * @param[in] scheduler Unused.
  * @param[in] the_thread Unused.
+ * @param[in] priority_node Unused.
  * @param[in] deadline Unused.
+ * @param[in] queue_context Unused.
  *
  * @retval NULL Always.
  */
-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
 );
 
 /**
@@ -388,12 +396,16 @@ Thread_Control *_Scheduler_default_Release_job(
  *
  * @param[in] scheduler Unused.
  * @param[in] the_thread Unused.
+ * @param[in] priority_node Unused.
+ * @param[in] queue_context Unused.
  *
  * @retval NULL Always.
  */
-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
 );
 
 /**