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Select on channels (again)
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Date: 2006-08-23 (05:12)
From: Nathaniel Gray <n8gray@g...>
Subject: Re: [Caml-list] Re: Select on channels (again)
On 8/21/06, Jonathan Roewen <jonathan.roewen@gmail.com> wrote:
> > It sounds simple but doesn't work.  If select tells you a file
> > descriptor doesn't have data waiting you can't be sure there isn't
> > still data in the corresponding channel's buffer.  See the thread that
> > I referenced for a good discussion of why this is annoying.  For one
> > thing, it makes it impossible to use Marshal.from_channel without
> > potentially blocking.
> Either one of us is misunderstanding the other....
> Instead of using Pervasives.open_xxx, use Unix.openfile which returns
> Unix.file_descr, and also doesn't use internal ocaml buffering.
> Then, presumably, Unix.select would do what you expect, and then you
> can use Unix.in_channel_of_descr to get an ocaml in_channel to read
> from.

... which is buffered.  All ocaml channels are buffered, regardless of
their origins.


>>>-- Nathaniel Gray -- Caltech Computer Science ------>
>>>-- Mojave Project -- http://mojave.cs.caltech.edu -->