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, 8 insertions, 4 deletions

diff --git a/cpukit/rtems/src/ratemoncancel.c b/cpukit/rtems/src/ratemoncancel.c
index b4e899d296..cb95f54408 100644
--- a/cpukit/rtems/src/ratemoncancel.c
+++ b/cpukit/rtems/src/ratemoncancel.c
@@ -27,18 +27,22 @@ void _Rate_monotonic_Cancel(
   ISR_lock_Context       *lock_context
 )
 {
-  Per_CPU_Control *cpu_self;
-  Thread_Control  *update_priority;
+  Per_CPU_Control      *cpu_self;
+  Thread_queue_Context  queue_context;
 
   _Rate_monotonic_Acquire_critical( the_period, lock_context );
 
   _Watchdog_Per_CPU_remove_relative( &the_period->Timer );
   the_period->state = RATE_MONOTONIC_INACTIVE;
-  update_priority = _Scheduler_Cancel_job( the_period->owner );
+  _Scheduler_Cancel_job(
+    the_period->owner,
+    &the_period->Priority,
+    &queue_context
+  );
 
   cpu_self = _Thread_Dispatch_disable_critical( lock_context );
   _Rate_monotonic_Release( the_period, lock_context );
-  _Thread_Update_priority( update_priority );
+  _Thread_Priority_update( &queue_context );
   _Thread_Dispatch_enable( cpu_self );
 }