[Octave-bug-tracker] [bug #55225] building doc figures in .eps or .pdf format occasionally silently fails

[Pantxo Diribarne]

Follow-up Comment #44, bug #55225 (project octave):

@Hg200: You are right, the slot never gets called.

I drew my previous erroneous conclusions while using a patch (attached as
tst_print.patch) that changes the way we execute the slots.  

I used the following for testing


rm -rf /tmp/t1/*
rm -rf /tmp/tst_print.log
parallel -j 32 -N0 -q ./run-octave --norc --silent --no-history --eval 'figure
("visible", "off"); plot ([1,2]); pipeline = ["/tmp/t1/file-" num2str({#})
".ps"]; drawnow ("eps", pipeline);' ::: {1..256} > /tmp/tst_print.log 2>
/dev/null
ls -c /tmp/t1/ | wc -l


With this patch I see that:
* the ObjectProxy pointer is always valid in qt_graphics_toolkit::print_figure
(so I was still wrong): "failed "is never printed
* sometimes "Sending print" (and the rest) is not printed: so it means that
the problem is that the proxy is not fully constructed and doesn't hold a
valid Figure Object (m_object member).

My conclusion is that making the initialization of ObjectProxy synchronous
would probably solve this, at least it does for me with the second attached
patch.


(file #49171, file #49172)
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Additional Item Attachment:

File name: tst_print.patch                Size:2 KB
    <https://savannah.gnu.org/file/tst_print.patch?file_id=49171>

File name: bug55225.patch                 Size:1 KB
    <https://savannah.gnu.org/file/bug55225.patch?file_id=49172>



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