unix-bytestring v0.2.0 (Was: Re: Proposal: add ByteString support to unix:System.Posix.IO API)
wren ng thornton
wren at freegeek.org
Mon Mar 7 12:38:04 CET 2011
On 3/6/11 10:19 PM, Tyson Whitehead wrote:
> On March 5, 2011 07:30:24 wren ng thornton wrote:
>> P.S., what the heck is readv(2) supposed to be good for? Does anyone
>> want to see a binding for it?
> Strikes me as something you might want to use in code that is orientated
> towards working with chunks of data of a possibly fixed maximum size (i.e., a
> chunk orientated steaming environment).
> The readv call gives you the ability to fill a series of chunks (e.g., from a
> free chunk list or something) with one call into the kernel. This could be a
> significant improvement from being forced to fill them individually.
Doh. For some reason I overlooked the fact that each iovec carries its
length, and was wondering how it "performs the same action, but scatters
the input data into the @iovcnt@ buffers". Makes a bit more sense if
it's just filling up a segmented buffer.
I might as well give a raw binding for it and think about what a decent
non-raw version should look like.
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