> > What has to be "fully reentrant and thread safe"?
> 
> In this context, probably the exception mechanism and the 
> handlers of exceptions that are used in both mainline code 
> and inside of an interrupt handler. (Unless you of course 
> don't use exceptions in interrupts, which may be a reasonable 
> restriction.)

OK, then why should that be more problematic than any other code that
must be reentrant?

Wouter van Ooijen

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