score: Introduce CPU budget operations

This patch set replaces the CPU budget algorithm enumeration with a set of CPU
budget operations which implement a particular CPU budget algorithm.  This
helps to hide the CPU budget algorithm implementation details from the general
thread handling.  The CPU budget callouts are turned into CPU budget
operations.  This slightly reduces the size of the thread control block.

All schedulers used the default scheduler tick implementation.  The tick
scheduler operation is removed and the CPU budget operations are directly used
in _Watchdog_Tick() if the executing thread uses a CPU budget algorithm.  This
is performance improvement for all threads which do not use a CPU budget
algorithm (default behaviour).

1 files changed, 0 insertions, 17 deletions

diff --git a/cpukit/include/rtems/score/scheduler.h b/cpukit/include/rtems/score/scheduler.h
index df9477fbeb..ad9d630023 100644
--- a/cpukit/include/rtems/score/scheduler.h
+++ b/cpukit/include/rtems/score/scheduler.h
@@ -217,9 +217,6 @@ typedef struct {
     Thread_queue_Context *
   );
 
-  /** @see _Scheduler_Tick() */
-  void ( *tick )( const Scheduler_Control *, Thread_Control * );
-
   /** @see _Scheduler_Start_idle() */
   void ( *start_idle )(
     const Scheduler_Control *,
@@ -544,20 +541,6 @@ void _Scheduler_default_Cancel_job(
 );
 
 /**
- * @brief Performs tick operations depending on the CPU budget algorithm for
- * each executing thread.
- *
- * This routine is invoked as part of processing each clock tick.
- *
- * @param scheduler The scheduler.
- * @param[in, out] executing An executing thread.
- */
-void _Scheduler_default_Tick(
-  const Scheduler_Control *scheduler,
-  Thread_Control          *executing
-);
-
-/**
  * @brief Starts an idle thread.
  *
  * @param scheduler This parameter is unused.