[plt-scheme] Process hangs with big input

Setup PLT's bug is fixed, as far as I know.

It was more subtle, but related.

Robby

At Tue, 14 Mar 2006 06:37:34 -0800, "Williams, M. Douglas" wrote:
> I wonder if this is the problem that setup has with decompressing large
> files.  It also is multi-threaded.
> 
> > -----Original Message-----
> > From: plt-scheme-bounces at list.cs.brown.edu [mailto:plt-scheme-
> > bounces at list.cs.brown.edu] On Behalf Of Robby Findler
> > Sent: Tuesday, March 14, 2006 7:33 AM
> > To: Noel Welsh
> > Cc: plt-scheme
> > Subject: Re: [plt-scheme] Process hangs with big input
> > 
> > Yes, the ports created by process are buffered.
> > 
> > If you have a lot of output and can do something with it as it comes
> > (rather than waiting until it all shows up), it is probably better to
> > just work directly with the ports, rather than waiting for the process
> > to finish and creating intermediate strings. The combination of our
> > new(ish) ports library and CML-style message passing concurrency makes
> > this easy to do and it scales to lots of data.
> > 
> > If, however, you really want the output in a string, create a pipe and
> > a thread. Have the thread copy the out and/or err to one side of the
> > pipe and get a string from the other side of the pipe (don't forget to
> > have the thread close the ports when it is done copying). Pipes can be
> > created with an internal buffer that is unbounded.
> > 
> > What are you doing, in this particular case?
> > 
> > Robby
> > 
> > At Tue, 14 Mar 2006 06:23:54 -0800 (PST), Noel Welsh wrote:
> > > Hi all,
> > >
> > > I'm trying to control an external process (svn) using the
> > > process function in (lib "process.ss")  I want to capture
> > > the output so I've wrapped process in this fucntion from
> > > the Scheme Cookbook:
> > >
> > >   (define (system/output command-string)
> > >     (let-values (((out in id err ctrl)
> > >                   (apply values (process command-string))))
> > >       (ctrl 'wait)  ;; wait for the process to finish
> > >       (begin0
> > >           (case (ctrl 'status)
> > >             ((done-ok)
> > >              (port->string out))
> > >             (else #f))
> > >         (close-output-port in)
> > >         (close-input-port out)
> > >         (close-input-port err))))
> > >
> > >
> > > When the process creates a small amount of output
> > > system/output terminates.  When the process creates a large
> > > amount of output it never terminates.  Debugging by hand I
> > > always get:
> > >
> > > > (ctrl 'status)
> > > running
> > >
> > > Could there be a buffer that fills up, preventing the
> > > process from writing my output and terminating.  Looking
> > > through process.ss has not shed much light.
> > >
> > > Thanks,
> > > Noel
> > >
> > > Email: noelwelsh <at> yahoo <dot> com   noel <at> untyped <dot> com
> > > AIM: noelhwelsh
> > > Blogs: http://monospaced.blogspot.com/  http://www.untyped.com/untyping/
> > >
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