diff options
Diffstat (limited to 'cpukit/score/include/rtems/score/schedulersmpimpl.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/schedulersmpimpl.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/cpukit/score/include/rtems/score/schedulersmpimpl.h b/cpukit/score/include/rtems/score/schedulersmpimpl.h index 61fbff534f..20c5d17ee7 100644 --- a/cpukit/score/include/rtems/score/schedulersmpimpl.h +++ b/cpukit/score/include/rtems/score/schedulersmpimpl.h @@ -92,12 +92,14 @@ static inline void _Scheduler_SMP_Allocate_processor( _Thread_Set_CPU( heir, cpu_of_victim ); + cpu_of_victim->heir = heir; + /* - * FIXME: Here we need atomic store operations with a relaxed memory order. - * The _CPU_SMP_Send_interrupt() will ensure that the change can be - * observed consistently. + * It is critical that we first update the heir and then the dispatch + * necessary so that _Thread_Dispatch() cannot miss an update. */ - cpu_of_victim->heir = heir; + _Atomic_Fence( ATOMIC_ORDER_RELEASE ); + cpu_of_victim->dispatch_necessary = true; if ( cpu_of_victim != cpu_of_executing ) { |