Re: Proposal: add createPipe to base

10 Mar 2014

      On Mar 10, 2014 1:54 PM, "Johan Tibell"  wrote:
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On Mon, Mar 10, 2014 at 1:47 PM, Ian Lynagh  wrote:
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On Mon, Mar 10, 2014 at 02:32:06PM +0200, Michael Snoyman wrote:
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On Mon, Mar 10, 2014 at 2:30 PM, Johan Tibell 
wrote:
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I propose we add it to System.IO. Note that we'd have to copy the 5
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in System.Posix.IO.createPipe into base as the above implementation
would
otherwise depend on the unix package.
+1. I've needed this in the past when working with process, and ended
up
writing POSIX-only code as a result.
Would it make more sense to put it in process, and thus avoid needing to
copy/move code into base?
I'm certainly open to that idea. If the only uses of pipes are for
lines
processes, I think that makes sense. Are there any typical non-process uses
of pipes? I can't think of any right now.

Yes: transferring data from one socket to another in a zero-copy fashion
using the 'splice' syscall in Linux requires passing stuff through a pipe
(used as a buffer).
I for one wouldn't consider a dependency on 'process' to write such code
(if I ever would in Haskell...) to be a problem though.

Nicolas

Re: Proposal: add createPipe to base

Nicolas Trangez