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Re: OSProcess command - non responding image when calling often

Posted by Thierry Goubier on Jun 07, 2016; 7:43am
URL: https://forum.world.st/OSProcess-command-non-responding-image-when-calling-often-tp4899540p4899548.html

Hi Sabine,

which version of Pharo are you using? I had similar issues, and I managed to reduce those occurrences to a reasonable level by changing the way I called OSProcess (and a lot of help from Dave). I do have sometime lockups with OSSubprocess as well, but those are also rare.

(I do think this is a bug somewhere in the VM which makes it loose signals)

The code I use is in GitFileTree: a low-level way of calling OSProcess which seems good at minimizing lockups.

Thierry



2016-06-07 9:31 GMT+02:00 Sabine Manaa <[hidden email]>:
Hi,

sorry but I have another issue with OSProcess.

For my app, I want to show small .png previews from my .pdfs. For this
reason, I use an external software, currently pdfbox. It works fine, but
regularly, I get a hanging image. I tried to reproduce it and found out,
that it is not a problem with pdfbox (http://pdfbox.apache.org), because
from command line, I can call it often without problems. There can be
(hopefully) many users in my app with many previews at one time. So I have
to call it often.

For reproduction of the OSProcess issue, I used another simple command (from
my other OSProcess umlaut issue :-)) to test it.

calling this, results in a non responding image:

20 timesRepeat: [OSProcess   command: ('cp
/Library/WebServer/Documents/reports/bar.pdf
/Library/WebServer/Documents/reports/test-c.pdf').].

also this:
20 timesRepeat: [OSProcess   command: ('echo "Hi there"').]

My original code is similar to this but here only for information:
OSProcess
                command:
                        ('{1} -jar {2} PDFToImage -format PNG -page 1 -dpi 100 {3}'
                                format:
                                        {'Library/Internet\
Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java'.
                                        '/Users/sabine/Desktop/pdfbox-app-2.0.1.jar'.

'/Library/WebServer/Documents/reports/201411121510-112859865-3378921/20150605_170_IFA_Berlin_Reisekostenabrechnung.pdf'}).


So, my question is: is it wrong, calling OSProcess like this? How to do it
instead?

I am sorry to ask again and hope that there is a simple solution.
Or is it a bug in OSProcess?

Regards
Sabine




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