On 18/12/14 11:22, Hesham Moustafa wrote:
PS:
>
>The unlimited objects feature and the identifier to object translation in
>general are also a huge problem for SMP.
>
Could you provide more details? I may work on this problem alongside
some SMP locks implementation part of my research.
The _Objects_Get() obtains the Giant lock and then uses
information->local_table[ index ] to get the object. For fine grained
locking have have to get the object without locks, but this is a problem
since _Objects_Extend_information() allocates a new table and frees the
old one. There is a time frame in which we might access freed memory.
One option is to disable interrupts before the information->local_table[
index ] since this would make the time frame very short.
A general question is whether the identifier to object translations
should be completely dropped.
--
Sebastian Huber, embedded brains GmbH
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