On 21/08/2010 04:30, John Millikin wrote:
This also changes the binary enumHandle to use non-blocking IO, as
recommended by Magnus Therning. I'm embarrassed to admit I still don't
understand the improvement, exactly, but three people so far have told
me it's a good idea.
The issue is that hGet always waits for a complete buffer-full of data
before returning. The hWaitForInput/hGetNonBlocking combination fixes
that problem, but you have to be careful to make sure that the Handle is
in binary mode, otherwise hWaitForInput will not behave the way you
expect (it will decode the input byte stream, and wait for a full
character). For more information, see
http://hackage.haskell.org/trac/ghc/ticket/3808
A better fix is to use hGetBufSome, but (a) it is only available in GHC
6.14 which isn't released yet, and (b) there isn't a bytestring wrapper
for it yet.
Cheers,
Simon
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