diff options
Diffstat (limited to 'cpukit/score/include/rtems/score/percpu.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/percpu.h | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/cpukit/score/include/rtems/score/percpu.h b/cpukit/score/include/rtems/score/percpu.h index 7a4c70e646..8acd867fcb 100644 --- a/cpukit/score/include/rtems/score/percpu.h +++ b/cpukit/score/include/rtems/score/percpu.h @@ -166,6 +166,12 @@ typedef struct { */ uint32_t isr_nest_level; + /** + * @brief The thread dispatch critical section nesting counter which is used + * to prevent context switches at inopportune moments. + */ + volatile uint32_t thread_dispatch_disable_level; + /** This is set to true when this CPU needs to run the dispatcher. */ volatile bool dispatch_necessary; @@ -267,9 +273,14 @@ extern Per_CPU_Control_envelope _Per_CPU_Information[] CPU_STRUCTURE_ALIGNMENT; #if defined( RTEMS_SMP ) static inline Per_CPU_Control *_Per_CPU_Get( void ) { - _Assert_Thread_dispatching_repressed(); + Per_CPU_Control *per_cpu = + &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu; - return &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu; + _Assert( + per_cpu->thread_dispatch_disable_level != 0 || _ISR_Get_level() != 0 + ); + + return per_cpu; } #else #define _Per_CPU_Get() ( &_Per_CPU_Information[ 0 ].per_cpu ) @@ -325,6 +336,8 @@ void _Per_CPU_Wait_for_state( * On a non SMP system, the _SMP_Get_current_processor() is defined to 0. * Thus when built for non-SMP, there should be no performance penalty. */ +#define _Thread_Dispatch_disable_level \ + _Per_CPU_Get()->thread_dispatch_disable_level #define _Thread_Heir \ _Per_CPU_Get()->heir #define _Thread_Executing \ @@ -373,9 +386,13 @@ void _Per_CPU_Wait_for_state( */ #define PER_CPU_ISR_NEST_LEVEL \ PER_CPU_END_STACK -#define PER_CPU_DISPATCH_NEEDED \ +#define PER_CPU_THREAD_DISPATCH_DISABLE_LEVEL \ PER_CPU_ISR_NEST_LEVEL + 4 +#define PER_CPU_DISPATCH_NEEDED \ + PER_CPU_THREAD_DISPATCH_DISABLE_LEVEL + 4 +#define THREAD_DISPATCH_DISABLE_LEVEL \ + (SYM(_Per_CPU_Information) + PER_CPU_THREAD_DISPATCH_DISABLE_LEVEL) #define ISR_NEST_LEVEL \ (SYM(_Per_CPU_Information) + PER_CPU_ISR_NEST_LEVEL) #define DISPATCH_NEEDED \ |