bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

>> > It could be "call as soon as we got 100 file names", for example.  The
>> > number can even be a separate parameter passed to the API.
>> 
>> Will consing the filename strings also be delayed until the callback is 
>> invoked?
>
> No.  I don't think it's possible (or desirable).  We could keep them
> in some malloc'ed buffer, of course, but what's the point?  This would
> only be justified if somehow creation of Lisp strings proved to be a
> terrible bottleneck, which would leave me mightily surprised.

Thanks for the clarification!
Then, would it make sense to have such a callback API more general? (not
just for listing directory files).

For example, the callbacks might be attached to a list variable that
will accumulate the async results. Then, the callbacks will be called on
that list, similar to how process sentinels are called when a chunk of
output is arriving to the process buffer.

-- 
Ihor Radchenko // yantar92,
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