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, 12 insertions, 1 deletions

diff --git a/cpukit/posix/src/mutexsetprioceiling.c b/cpukit/posix/src/mutexsetprioceiling.c
index 31e54c5fc3..aaea57ddfb 100644
--- a/cpukit/posix/src/mutexsetprioceiling.c
+++ b/cpukit/posix/src/mutexsetprioceiling.c
@@ -64,7 +64,18 @@ int pthread_mutex_setprioceiling(
 
     new_priority = _POSIX_Priority_To_core( scheduler, prioceiling, &valid );
     if ( valid ) {
-      _CORE_ceiling_mutex_Set_priority( &the_mutex->Mutex, new_priority );
+      Thread_queue_Context  queue_context;
+      Per_CPU_Control      *cpu_self;
+
+      _Thread_queue_Context_clear_priority_updates( &queue_context );
+      _CORE_ceiling_mutex_Set_priority(
+        &the_mutex->Mutex,
+        new_priority,
+        &queue_context
+      );
+      cpu_self = _Thread_Dispatch_disable();
+      _Thread_Priority_update( &queue_context );
+      _Thread_Dispatch_enable( cpu_self );
       error = 0;
     } else {
       error = EINVAL;