SMP: ISR disable/enable vs. mutual exclustion

[Sebastian Huber]

On 2013-08-24 04:10, Chris Johns wrote:
>> Thus the normal extract operation is not available on SMP. An extract
>> variant which needs also the chain control as a parameter must be used.
>
> I think a node may need a back pointer to the chain control that contains a
> lock. I suspect we cannot have a single score chain control structure for both
> protected and unprotected operations and support the current extract. I have
> not looked at all the uses of extract in the code so I do not know if the chain
> control is available and even it is I think the node should handle this.

In order to use the back pointer you have to lock the chain, so this cannot be 
used.  You have to know on which chain the node is.

-- 
Sebastian Huber, embedded brains GmbH

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