diff options
Diffstat (limited to 'cpukit/include/rtems/score/schedulerimpl.h')
| -rw-r--r-- | cpukit/include/rtems/score/schedulerimpl.h | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/cpukit/include/rtems/score/schedulerimpl.h b/cpukit/include/rtems/score/schedulerimpl.h index 24db4d7818..98f8e337fd 100644 --- a/cpukit/include/rtems/score/schedulerimpl.h +++ b/cpukit/include/rtems/score/schedulerimpl.h @@ -611,12 +611,30 @@ RTEMS_INLINE_ROUTINE void _Scheduler_Cancel_job( */ RTEMS_INLINE_ROUTINE void _Scheduler_Tick( const Per_CPU_Control *cpu ) { - const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU( cpu ); - Thread_Control *executing = cpu->executing; + const Scheduler_Control *scheduler; + Thread_Control *executing; + + scheduler = _Scheduler_Get_by_CPU( cpu ); - if ( scheduler != NULL && executing != NULL ) { - ( *scheduler->Operations.tick )( scheduler, executing ); +#if defined(RTEMS_SMP) + if ( scheduler == NULL ) { + /* + * In SMP configurations, processors may be removed/added at runtime + * from/to a scheduler. There may be still clock interrupts on currently + * unassigned processors. + */ + return; } +#endif + + /* + * Each online processor has at least an idle thread as the executing thread + * even in case it has currently no scheduler assigned. Clock interrupts on + * processors which are not online would be a severe bug of the Clock Driver. + */ + executing = _Per_CPU_Get_executing( cpu ); + _Assert( executing != NULL ); + ( *scheduler->Operations.tick )( scheduler, executing ); } /** |