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bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files'


From: Michael Heerdegen
Subject: bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files'
Date: Fri, 02 Mar 2018 14:13:59 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.91 (gnu/linux)

Noam Postavsky <address@hidden> writes:

> Ah, so let me be more precise.  Iterating over (stream-range 1 n) should
> require only a constant amount of *reachable* memory at any particular
> instant.  So your example above is okay, but the following one would be
> not acceptable (I mean, it's fine if some random lisp code does that,
> but stream-range should not be creating such long lists, or equivalently
> large structures):
>
>     (let ((list nil))
>       (dotimes (i 1000000)
>         (push i list)
>         (message "%S" (car list))))

Yes, absolutely agreed.

Using streams, you can logically refer to the complete list of elements
as one object, but the programmer must ensure that the referable list of
generated elements doesn't get too large.

Michael.





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