score: Add Thread_Configuration

Add the Thread_Configuration structure to reduce the parameter count of
_Thread_Initialize().  This makes it easier to add more parameters in
the future.  It simplifies the code generation since most architectures
do not have that many registers available for function parameters.

Update #3835.

1 files changed, 17 insertions, 20 deletions

diff --git a/cpukit/score/src/threadcreateidle.c b/cpukit/score/src/threadcreateidle.c
index 3e6f19ee69..e7243ae09c 100644
--- a/cpukit/score/src/threadcreateidle.c
+++ b/cpukit/score/src/threadcreateidle.c
@@ -25,21 +25,31 @@
 #include <rtems/score/userextimpl.h>
 #include <rtems/config.h>
 
+#include <string.h>
+
 static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu )
 {
-  Objects_Name             name;
+  Thread_Configuration     config;
   Thread_Control          *idle;
-  const Scheduler_Control *scheduler;
 
-  scheduler = _Scheduler_Get_by_CPU( cpu );
+  memset( &config, 0, sizeof( config ) );
+  config.scheduler = _Scheduler_Get_by_CPU( cpu );
 
 #if defined(RTEMS_SMP)
-  if (scheduler == NULL) {
+  if ( config.scheduler == NULL ) {
     return;
   }
 #endif
 
-  name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' );
+  config.stack_size = rtems_configuration_get_idle_task_stack_size();
+  config.priority = _Scheduler_Map_priority(
+    config.scheduler,
+    config.scheduler->maximum_priority
+  );
+  config.budget_algorithm = THREAD_CPU_BUDGET_ALGORITHM_NONE;
+  config.name.name_u32 = _Objects_Build_name( 'I', 'D', 'L', 'E' );
+  config.is_fp = CPU_IDLE_TASK_IS_FP;
+  config.is_preemptible = true;
 
   /*
    *  The entire workspace is zeroed during its initialization.  Thus, all
@@ -49,20 +59,7 @@ static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu )
   idle = _Thread_Internal_allocate();
   _Assert( idle != NULL );
 
-  _Thread_Initialize(
-    &_Thread_Information,
-    idle,
-    scheduler,
-    NULL,        /* allocate the stack */
-    rtems_configuration_get_idle_task_stack_size(),
-    CPU_IDLE_TASK_IS_FP,
-    _Scheduler_Map_priority( scheduler, scheduler->maximum_priority ),
-    true,        /* preemptable */
-    THREAD_CPU_BUDGET_ALGORITHM_NONE,
-    NULL,        /* no budget algorithm callout */
-    0,           /* all interrupts enabled */
-    name
-  );
+  _Thread_Initialize( &_Thread_Information, idle, &config );
 
   /*
    *  WARNING!!! This is necessary to "kick" start the system and
@@ -78,7 +75,7 @@ static void _Thread_Create_idle_for_CPU( Per_CPU_Control *cpu )
   _Thread_Load_environment( idle );
 
   idle->current_state = STATES_READY;
-  _Scheduler_Start_idle( scheduler, idle, cpu );
+  _Scheduler_Start_idle( config.scheduler, idle, cpu );
   _User_extensions_Thread_start( idle );
 }