SMP: ISR disable/enable vs. mutual exclustion

[Sebastian Huber]

I will add the lock to the rtems_chain_control to keep it simple.

There is a big problem with the extract operation:

void _Chain_Extract(
   Chain_Node *node
)
{
   ISR_Level level;

   _ISR_Disable( level );
     _Chain_Extract_unprotected( node );
   _ISR_Enable( level );
}

Here we don't have access to the corresponding chain control and thus the lock 
object.

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.

-- 
Sebastian Huber, embedded brains GmbH

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