Proposal: add ByteString support to unix:System.Posix.IO API

wren ng thornton wren at
Wed Mar 2 04:25:18 CET 2011

On 3/1/11 10:00 PM, wren ng thornton wrote:
> On 3/1/11 6:01 PM, Daniel Fischer wrote:
>> On Tuesday 01 March 2011 23:51:05, Ganesh Sittampalam wrote:
>>> What's the practical difference between a (lazy) list of strict
>>> bytestrings and a lazy bytestring?
>> Lazy ByteStrings are head-strict. I don't know whether that's relevant
>> here, though.
> Or rather, element-strict. But I don't think that matters here, since
> writing requires element strictness anyways.
> It may be significant if I write new versions to use writev for
> lists/lazys instead of calling write repeatedly, since we'd have to
> force all elements before calling into C. But then writev would require
> forcing the spine anyways (to get the length in chunks) so it wouldn't
> affect asymptotic behavior or memory retention.

Where "it" in the last sentence means "forcing all the elements".

Live well,

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