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smp: Protect decrement operation

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This commit is contained in:
Sebastian Huber
2013-06-12 09:16:30 +02:00
parent a8ef3bf053
commit df244cfc30
1 changed files with 4 additions and 4 deletions
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8
cpukit/score/src/threaddispatchdisablelevel.c
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@@ -88,16 +88,16 @@ uint32_t _Thread_Dispatch_decrement_disable_level( void )
_ISR_Disable_on_this_core( isr_level ); _ISR_Disable_on_this_core( isr_level );
disable_level = _Thread_Dispatch_disable_level;
--disable_level;
_Thread_Dispatch_disable_level = disable_level;
--level_lock->nest_level; --level_lock->nest_level;
if ( level_lock->nest_level == 0 ) { if ( level_lock->nest_level == 0 ) {
level_lock->owner_cpu = NO_OWNER_CPU; level_lock->owner_cpu = NO_OWNER_CPU;
_SMP_lock_Release( &level_lock->lock ); _SMP_lock_Release( &level_lock->lock );
} }
disable_level = _Thread_Dispatch_disable_level;
--disable_level;
_Thread_Dispatch_disable_level = disable_level;
_ISR_Enable_on_this_core( isr_level ); _ISR_Enable_on_this_core( isr_level );
return disable_level; return disable_level;