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score: Add _Per_CPU_Get_snapshot()

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This commit is contained in:
Sebastian Huber
2014-04-14 08:37:04 +02:00
parent 67a7a2cc98
commit 198c143335
1 changed files with 12 additions and 3 deletions
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cpukit/score/include/rtems/score/percpu.h
+12 -3
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@@ -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 )