David Howells <dhowells@redhat.com> wrote:
>> 1, callee has no pre defined duty to help caller in general; they should not
>> try to do anything, however, to help their callers in principle due to
>> limited info on their hands IMO.
>
> Ah, no.  It's entirely reasonable for an API to specify that one of its
> methods will be called with one or more locks held - and that the method must
> be aware of this and may make use of this.
>
Fair and clear.

Thanks
Hillf