score: Add and use Scheduler_simple_Control

cpukit/sapi/include/confdefs.h

@@ -736,7 +736,7 @@ const rtems_libio_helper rtems_fs_init_helper =
    * define the memory used by the simple scheduler
    */
   #define CONFIGURE_MEMORY_FOR_SCHEDULER ( \
-    _Configure_From_workspace( sizeof(Chain_Control) ) \
+    _Configure_From_workspace( sizeof( Scheduler_simple_Control ) ) \
   )
   #define CONFIGURE_MEMORY_PER_TASK_FOR_SCHEDULER (0)
 #endif

cpukit/score/include/rtems/score/schedulersimple.h

@@ -54,6 +54,16 @@ extern "C" {
     _Scheduler_default_Start_idle         /* start idle entry point */ \
   }
 
+/**
+ * @brief Simple scheduler control.
+ */
+typedef struct {
+  /**
+   * @brief One ready queue for all ready threads.
+   */
+  Chain_Control Ready;
+} Scheduler_simple_Control;
+
 /**
  *  @brief Initialize simple scheduler.
  *

cpukit/score/include/rtems/score/schedulersimpleimpl.h

@@ -32,6 +32,11 @@ extern "C" {
  */
 /**@{**/
 
+RTEMS_INLINE_ROUTINE Scheduler_simple_Control *_Scheduler_simple_Instance( void )
+{
+  return _Scheduler.information;
+}
+
 /**
  * This routine puts @a the_thread on to the ready queue.
  *
@@ -101,9 +106,8 @@ RTEMS_INLINE_ROUTINE void _Scheduler_simple_Schedule_body(
   bool force_dispatch
 )
 {
-  Thread_Control *heir = (Thread_Control *) _Chain_First(
-    (Chain_Control *) _Scheduler.information
-  );
+  Scheduler_simple_Control *scheduler = _Scheduler_simple_Instance();
+  Thread_Control *heir = (Thread_Control *) _Chain_First( &scheduler->Ready );
 
   ( void ) thread;
 

cpukit/score/src/schedulersimple.c

@@ -25,16 +25,10 @@
 
 void _Scheduler_simple_Initialize ( void )
 {
-  void *f;
+  Scheduler_simple_Control *scheduler =
+    _Workspace_Allocate_or_fatal_error( sizeof( *scheduler ) );
 
-  /*
-   * Initialize Ready Queue
-   */
+  _Chain_Initialize_empty( &scheduler->Ready );
 
-  /* allocate ready queue structures */
-  f = _Workspace_Allocate_or_fatal_error( sizeof(Chain_Control) );
-  _Scheduler.information = f;
-
-  /* initialize ready queue structure */
-  _Chain_Initialize_empty( (Chain_Control *)f );
+  _Scheduler.information = scheduler;
 }

cpukit/score/src/schedulersimplereadyqueueenqueue.c

@@ -24,7 +24,8 @@ void _Scheduler_simple_Ready_queue_enqueue(
   Thread_Control    *the_thread
 )
 {
-  Chain_Control *ready = (Chain_Control *) _Scheduler.information;
+  Scheduler_simple_Control *scheduler =
+    _Scheduler_simple_Instance();
 
-  _Scheduler_simple_Insert_priority_fifo( ready, the_thread );
+  _Scheduler_simple_Insert_priority_fifo( &scheduler->Ready, the_thread );
 }

cpukit/score/src/schedulersimplereadyqueueenqueuefirst.c

@@ -24,7 +24,8 @@ void _Scheduler_simple_Ready_queue_enqueue_first(
   Thread_Control    *the_thread
 )
 {
-  Chain_Control *ready = (Chain_Control *) _Scheduler.information;
+  Scheduler_simple_Control *scheduler =
+    _Scheduler_simple_Instance();
 
-  _Scheduler_simple_Insert_priority_lifo( ready, the_thread );
+  _Scheduler_simple_Insert_priority_lifo( &scheduler->Ready, the_thread );
 }