Re: [Caml-list] input_line is blocking

[Gerd Stolpmann <info@gerd-stolpmann.de>]

On 2002.05.03 14:18 Warp wrote:
> Hi
> I'm running "ocamlc" by using Unix.open_process_full in order to write an
> automatic compiler.
> Right now, it's working fine, but I got now a problem with input_line :
> 
> after running open_process_full , i'm first reading all its stdout lines of
> the process until End_of_file is raised, then all its stderr lines using the
> same function.
> 
> It has work fine for few weeks now, but now I found that in some cases
> input_line will block, not raising End_of_file.

I wrote a library exactly for such advanced usage of sub processes:
http://www.ocaml-programming.de/packages/documentation/shell/

For example, to call ocamlc one would do:

open Shell
let stdout = Buffer.create 16 in
let stderr = Buffer.create 16 in
call ~stdout:(to_buffer stdout) ~stderr:(to_buffer stderr) [ cmd "ocamlc" args ]

The Shell library includes the necessary logic to read from multiple
file descriptors (using Unix.select). 

One drawback: Shell works only for Unix (because of Unix.fork). I think that you have
to use multi-threading for a platform-independent solution.

Gerd
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