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, 14 insertions, 10 deletions

diff --git a/cpukit/posix/src/pthreadsetschedparam.c b/cpukit/posix/src/pthreadsetschedparam.c
index 1c207e7887..165e1d86a8 100644
--- a/cpukit/posix/src/pthreadsetschedparam.c
+++ b/cpukit/posix/src/pthreadsetschedparam.c
@@ -40,14 +40,15 @@ static int _POSIX_Set_sched_param(
   Thread_queue_Context       *queue_context
 )
 {
-  const Scheduler_Control *scheduler;
-  int                      normal_prio;
-  bool                     valid;
-  Priority_Control         core_normal_prio;
+  const Scheduler_Control            *scheduler;
+  int                                 normal_prio;
+  bool                                valid;
+  Priority_Control                    core_normal_prio;
+  const Thread_CPU_budget_operations *cpu_budget_operations;
 #if defined(RTEMS_POSIX_API)
-  POSIX_API_Control       *api;
-  int                      low_prio;
-  Priority_Control         core_low_prio;
+  POSIX_API_Control                  *api;
+  int                                 low_prio;
+  Priority_Control                    core_low_prio;
 #endif
 
   normal_prio = param->sched_priority;
@@ -103,9 +104,12 @@ static int _POSIX_Set_sched_param(
   }
 #endif
 
-  the_thread->cpu_time_budget  = config->cpu_time_budget;
-  the_thread->budget_algorithm = config->budget_algorithm;
-  the_thread->budget_callout   = config->budget_callout;
+  cpu_budget_operations = config->cpu_budget_operations;
+  the_thread->CPU_budget.operations = cpu_budget_operations;
+
+  if ( cpu_budget_operations != NULL ) {
+    ( *cpu_budget_operations->initialize )( the_thread );
+  }
 
 #if defined(RTEMS_POSIX_API)
   _Priority_Node_set_priority( &api->Sporadic.Low_priority, core_low_prio );