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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-04-10 08:18:00 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-04-14 08:37:04 +0200 |
| commit | 198c143335c864198f30f8d800c54bb13cc0f15c (patch) | |
| tree | 5fb98b0f77f78843eb0554ff49de3822b5ad9473 | |
| parent | sparc: Use __leon__ multilib define (diff) | |
| download | rtems-198c143335c864198f30f8d800c54bb13cc0f15c.tar.bz2 | |
score: Add _Per_CPU_Get_snapshot()
| -rw-r--r-- | cpukit/score/include/rtems/score/percpu.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/cpukit/score/include/rtems/score/percpu.h b/cpukit/score/include/rtems/score/percpu.h index 75ff3e2b4d..9a6b1698fb 100644 --- a/cpukit/score/include/rtems/score/percpu.h +++ b/cpukit/score/include/rtems/score/percpu.h @@ -424,11 +424,20 @@ extern Per_CPU_Control_envelope _Per_CPU_Information[] CPU_STRUCTURE_ALIGNMENT; _ISR_Enable( isr_cookie ) #endif +/* + * If we get the current processor index in a context which allows thread + * dispatching, then we may already run on another processor right after the + * read instruction. There are very few cases in which this makes sense (here + * we can use _Per_CPU_Get_snapshot()). All other places must use + * _Per_CPU_Get() so that we can add checks for RTEMS_DEBUG. + */ +#define _Per_CPU_Get_snapshot() \ + ( &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu ) + #if defined( RTEMS_SMP ) static inline Per_CPU_Control *_Per_CPU_Get( void ) { - Per_CPU_Control *per_cpu = - &_Per_CPU_Information[ _SMP_Get_current_processor() ].per_cpu; + Per_CPU_Control *per_cpu = _Per_CPU_Get_snapshot(); _Assert( per_cpu->thread_dispatch_disable_level != 0 || _ISR_Get_level() != 0 @@ -437,7 +446,7 @@ static inline Per_CPU_Control *_Per_CPU_Get( void ) return per_cpu; } #else -#define _Per_CPU_Get() ( &_Per_CPU_Information[ 0 ].per_cpu ) +#define _Per_CPU_Get() _Per_CPU_Get_snapshot() #endif static inline Per_CPU_Control *_Per_CPU_Get_by_index( uint32_t index ) |