[Haskell-cafe] GHC + interactive input/output
philip.weaver at gmail.com
Fri Feb 8 20:29:22 EST 2008
GHC certain *could* do this, but it's arguably not the right thing to do.
For performance, the operating system buffers writes until it is ready to
write large chunks at a time. If you do not want this behavior, change the
buffering mode from its default.
On Feb 8, 2008 5:07 PM, Jonathan Cast <jonathanccast at fastmail.fm> wrote:
> On 8 Feb 2008, at 4:50 PM, Brandon S. Allbery KF8NH wrote:
> > On Feb 8, 2008, at 19:41 , Philip Weaver wrote:
> >> Your "gsi> " is buffered because there's no newline at the end.
> >> To flush the buffer and force it to be printed immediately, use
> >> 'hFlush' from the System.IO library, or use 'hSetBuffering' from
> >> that same library: http://haskell.org/ghc/docs/latest/html/
> >> libraries/base/System-IO.html
> >> I believe you can observe the same behavior in C.
> > Most C stdio libraries in my experience have extra code in the
> > functions that read stdin to flush stdout first, specifically
> > because of lazy people who don't pay attention to buffering.
> Why can't GHC implement the same thing?
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