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, 28 insertions, 56 deletions

diff --git a/cpukit/score/src/scheduleredfreleasejob.c b/cpukit/score/src/scheduleredfreleasejob.c
index 4c74c48699..c19d9b9d24 100644
--- a/cpukit/score/src/scheduleredfreleasejob.c
+++ b/cpukit/score/src/scheduleredfreleasejob.c
@@ -20,75 +20,47 @@
 
 #include <rtems/score/scheduleredfimpl.h>
 
-static bool _Scheduler_EDF_Release_job_filter(
-  Thread_Control   *the_thread,
-  Priority_Control *new_priority_p,
-  void             *arg
+void _Scheduler_EDF_Release_job(
+  const Scheduler_Control *scheduler,
+  Thread_Control          *the_thread,
+  Priority_Node           *priority_node,
+  uint64_t                 deadline,
+  Thread_queue_Context    *queue_context
 )
 {
-  Scheduler_EDF_Node *node;
-  Priority_Control    current_priority;
-  Priority_Control    new_priority;
+  (void) scheduler;
 
-  node = _Scheduler_EDF_Thread_get_node( the_thread );
+  _Thread_Wait_acquire_critical( the_thread, queue_context );
 
-  current_priority = _Thread_Get_priority( the_thread );
-  new_priority = *new_priority_p;
+  _Priority_Node_set_priority( priority_node, deadline );
 
-  node->current_priority = new_priority;
-  the_thread->real_priority = new_priority;
+  if ( _Priority_Node_is_active( priority_node ) ) {
+    _Thread_Priority_changed(
+      the_thread,
+      priority_node,
+      false,
+      queue_context
+    );
+  } else {
+    _Thread_Priority_add( the_thread, priority_node, queue_context );
+  }
 
-  return _Thread_Priority_less_than( current_priority, new_priority )
-    || !_Thread_Owns_resources( the_thread );
+  _Thread_Wait_release_critical( the_thread, queue_context );
 }
 
-Thread_Control *_Scheduler_EDF_Release_job(
+void _Scheduler_EDF_Cancel_job(
   const Scheduler_Control *scheduler,
   Thread_Control          *the_thread,
-  uint64_t                 deadline
-)
-{
-  return _Thread_Apply_priority(
-    the_thread,
-    deadline,
-    NULL,
-    _Scheduler_EDF_Release_job_filter,
-    true
-  );
-}
-
-static bool _Scheduler_EDF_Cancel_job_filter(
-  Thread_Control   *the_thread,
-  Priority_Control *new_priority_p,
-  void             *arg
+  Priority_Node           *priority_node,
+  Thread_queue_Context    *queue_context
 )
 {
-  Scheduler_EDF_Node *node;
-  Priority_Control    current_priority;
-  Priority_Control    new_priority;
+  (void) scheduler;
 
-  node = _Scheduler_EDF_Thread_get_node( the_thread );
+  _Thread_Wait_acquire_critical( the_thread, queue_context );
 
-  current_priority = _Thread_Get_priority( the_thread );
-  new_priority = node->background_priority;
+  _Thread_Priority_remove( the_thread, priority_node, queue_context );
+  _Priority_Node_set_inactive( priority_node );
 
-  node->current_priority = new_priority;
-  the_thread->real_priority = new_priority;
-
-  return _Thread_Priority_less_than( current_priority, new_priority )
-    || !_Thread_Owns_resources( the_thread );
-}
-
-Thread_Control *_Scheduler_EDF_Cancel_job(
-  const Scheduler_Control *scheduler,
-  Thread_Control          *the_thread
-)
-{
-  return _Thread_Apply_priority(
-    the_thread,
-    0,
-    NULL,
-    _Scheduler_EDF_Cancel_job_filter,
-    true
-  );
+  _Thread_Wait_release_critical( the_thread, queue_context );
 }