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, 3 insertions, 0 deletions

diff --git a/cpukit/score/src/threadtimeout.c b/cpukit/score/src/threadtimeout.c
index b6b6cc4ac2..8297c55c4b 100644
--- a/cpukit/score/src/threadtimeout.c
+++ b/cpukit/score/src/threadtimeout.c
@@ -30,6 +30,8 @@ void _Thread_Timeout( Watchdog_Control *watchdog )
   bool                  unblock;
 
   the_thread = RTEMS_CONTAINER_OF( watchdog, Thread_Control, Timer.Watchdog );
+
+  _Thread_queue_Context_clear_priority_updates( &queue_context );
   _Thread_Wait_acquire( the_thread, &queue_context );
 
   wait_flags = _Thread_Wait_flags_get( the_thread );
@@ -66,6 +68,7 @@ void _Thread_Timeout( Watchdog_Control *watchdog )
   }
 
   _Thread_Wait_release( the_thread, &queue_context );
+  _Thread_Priority_update( &queue_context );
 
   if ( unblock ) {
     _Thread_Wait_tranquilize( the_thread );