[Scilab-users] Using Scilab cli from Java

[Calixte Denizet]

Hi Victor,

I reported the bug:
http://bugzilla.scilab.org/show_bug.cgi?id=11969

and proposed a patch:
http://codereview.scilab.org/#/c/9394/

Thanks

Calixte

On 08/10/2012 14:48, Victor Noël wrote:
> Hi,
>
> We need in a joint research/industrial project to run scilab functions
> from Java. Since javasci does not allow multiple engine to run at the
> same time (as we need each of these execution to be persistent during a
> long time with global variables, and there could be name clashes between
> them), we decided to spawn the scilab cli for each function and interact
> with it using stdin and stdout.
>
> This works well, but ONLY under windows.
>
> For a reason we ignore, stdout does not seem to produce any output under
> Linux. I defined a simple test case to illustrate the problem, it runs
> under windows but not under Linux.
>
> It is joined to this email.
> Running it should produce the display of "test" in the console.
>
> To illustrate the fact that the problem here is not linked to deadlocks
> created by threads and a small stream buffer (as it is a famous reason
> for this kind of problem), I put the reading of stderr and stdout in
> threads.
>
> What we noticed is the following:
>   - closing stdin unblocks stdout (but makes the process useless)
>   - redirecting stdout to a file does not work either
>   - redirecting stdout to the java process's stdout does work!
>
> I have the feeling this is linked Scilab itself and not just to the java
> code responsible of executing processes, that's why I ask the question
> here, but I may be wrong, and in that case, I'm sorry for the noise.
>
> This is really blocking and I'm starting to get desperate about fixing
> this (even more because I had a lot of hopes in porting our prototype to
> Linux :)
>
> Thank you for any help you can provide
>
> Victor
>
>
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-- 
Calixte Denizet
Software Development Engineer
-----------------------------------------------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles, France
http://www.scilab-enterprises.com

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