[Haskell-cafe] Re: Hugs vs GHC (again)was: Re: Somerandomnewbiequestions

Duncan Coutts duncan.coutts at worc.ox.ac.uk
Tue Jan 18 18:23:52 EST 2005

On Tue, 2005-01-18 at 22:52 +0000, Glynn Clements wrote:
> Ben Rudiak-Gould wrote:

> Essentially, reading data from regular files is always deemed to occur
> "soon", so the usual mechanisms for dealing with "slow" I/O (i.e. 
> pipes, FIFOs, character devices, sockets) don't work. This applies
> equally to non-blocking I/O (O_NONBLOCK), asynchronous I/O (O_ASYNC),
> select(), poll() etc.

Yes, there are very few systems that do genuine async IO. I believe that
Solaris and the Win NT kernel are supposed to be able to do this, though
the interfaces to these features are apparently rather hard to use. I've
heard that Linux is going to gain proper async IO for ordinary buffered
(as opposed to direct IO) files some time in the not too distant future.


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