score: Delete CORE_mutex_Control::holder_id

We can use the holder pointer to get the identifier if necessary.

cpukit/libmisc/monitor/mon-sema.c

@@ -24,8 +24,7 @@ rtems_monitor_sema_canonical(
     canonical_sema->priority_ceiling =
       rtems_sema->Core_control.mutex.Attributes.priority_ceiling;
 
-    canonical_sema->holder_id        =
-      rtems_sema->Core_control.mutex.holder_id;
+    canonical_sema->holder_id = 0;
 
     if (_Attributes_Is_counting_semaphore(canonical_sema->attribute)) {
       /* we have a counting semaphore */
@@ -36,6 +35,12 @@ rtems_monitor_sema_canonical(
 	rtems_sema->Core_control.semaphore.Attributes.maximum_count;
     }
     else {
+      Thread_Control *holder = rtems_sema->Core_control.mutex.holder;
+
+      if (holder != NULL) {
+        canonical_sema->holder_id = holder->Object.id;
+      }
+
       /* we have a binary semaphore (mutex) */
       canonical_sema->cur_count        = rtems_sema->Core_control.mutex.lock;
       canonical_sema->max_count        = 1; /* mutex is either 0 or 1 */

cpukit/score/include/rtems/score/coremutex.h

@@ -167,8 +167,6 @@ typedef struct {
    *  has not unlocked it.  If the thread is not locked, there is no holder.
    */
   Thread_Control         *holder;
-  /** This element contains the object Id of the holding thread.  */
-  Objects_Id              holder_id;
 #ifdef __RTEMS_STRICT_ORDER_MUTEX__
   /** This field is used to manipulate the priority inheritance mutex queue*/
   CORE_mutex_order_list   queue;

cpukit/score/include/rtems/score/coremuteximpl.h

@@ -454,7 +454,6 @@ RTEMS_INLINE_ROUTINE int _CORE_mutex_Seize_interrupt_trylock_body(
   if ( !_CORE_mutex_Is_locked( the_mutex ) ) {
     the_mutex->lock       = CORE_MUTEX_LOCKED;
     the_mutex->holder     = executing;
-    the_mutex->holder_id  = executing->Object.id;
     the_mutex->nest_count = 1;
     if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
          _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ){

cpukit/score/src/coremutex.c

@@ -42,7 +42,6 @@ CORE_mutex_Status _CORE_mutex_Initialize(
   if ( initial_lock == CORE_MUTEX_LOCKED ) {
     the_mutex->nest_count = 1;
     the_mutex->holder     = executing;
-    the_mutex->holder_id  = executing->Object.id;
     if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) ||
          _CORE_mutex_Is_priority_ceiling( &the_mutex->Attributes ) ) {
 
@@ -60,7 +59,6 @@ CORE_mutex_Status _CORE_mutex_Initialize(
   } else {
     the_mutex->nest_count = 0;
     the_mutex->holder     = NULL;
-    the_mutex->holder_id  = 0;
   }
 
   _Thread_queue_Initialize(

cpukit/score/src/coremutexsurrender.c

@@ -172,8 +172,7 @@ CORE_mutex_Status _CORE_mutex_Surrender(
       _Thread_Change_priority( holder, holder->real_priority, true );
     }
   }
-  the_mutex->holder    = NULL;
-  the_mutex->holder_id = 0;
+  the_mutex->holder = NULL;
 
   /*
    *  Now we check if another thread was waiting for this mutex.  If so,
@@ -185,7 +184,6 @@ CORE_mutex_Status _CORE_mutex_Surrender(
     if ( !_Objects_Is_local_id( the_thread->Object.id ) ) {
 
       the_mutex->holder     = NULL;
-      the_mutex->holder_id  = the_thread->Object.id;
       the_mutex->nest_count = 1;
 
       ( *api_mutex_mp_support)( the_thread, id );
@@ -195,7 +193,6 @@ CORE_mutex_Status _CORE_mutex_Surrender(
     {
 
       the_mutex->holder     = the_thread;
-      the_mutex->holder_id  = the_thread->Object.id;
       the_mutex->nest_count = 1;
 
       switch ( the_mutex->Attributes.discipline ) {