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, 1 insertions, 2 deletions

diff --git a/testsuites/smptests/smpmutex01/init.c b/testsuites/smptests/smpmutex01/init.c
index 5adc2e2244..93c059e6fc 100644
--- a/testsuites/smptests/smpmutex01/init.c
+++ b/testsuites/smptests/smpmutex01/init.c
@@ -315,10 +315,9 @@ static void test(void)
   request(ctx, B_5_0, REQ_MTX_RELEASE);
   check_generations(ctx, B_5_0, A_2_1);
   assert_prio(ctx, B_5_0, 5);
-  assert_prio(ctx, A_2_1, 0);
+  assert_prio(ctx, A_2_1, 2);
   request(ctx, A_2_1, REQ_MTX_RELEASE);
   check_generations(ctx, A_2_1, B_5_1);
-  assert_prio(ctx, A_2_1, 2);
   assert_prio(ctx, B_5_1, 5);
   request(ctx, B_5_1, REQ_MTX_RELEASE);
   check_generations(ctx, B_5_1, NONE);