[PD] close all patches on quit sourceforge patch

Hans-Christoph Steiner hans at at.or.at
Thu Oct 25 03:07:47 CEST 2012

I just tried the latest pd-l2ork from git, and it doesn't seem to start
correctly.  I did:

cd pd/src

I also tried:

cd ../bin

All I got was a great square window with no menu.  I'm on Linux Mint 13 Maya
amd64, which is basically Ubuntu/Precise.


On 10/24/2012 08:47 PM, Ivica Bukvic wrote:
> It is only the draw command, not the communication...
> BTW do either of you know why one would be getting pdtk_post { stack
> overflow } messages? Doors that mean the cpu is unable to handle all gui
> requests?
> On Oct 24, 2012 8:32 PM, "Hans-Christoph Steiner" <hans at at.or.at> wrote:
>> Thanks for that info.  Sounds like a good idea in general.  I personally
>> can't
>> think of any reason why the DSP would need to be on during the quitting.
>>  But
>> for the 'redraw' part, that depends.  If it is literally only redrawing
>> that
>> is suspended, that would be fine.  But if its all Pd<-->GUI communications,
>> that will probably cause problems.
>> .hc
>> On 10/24/2012 06:02 PM, Ivica Ico Bukvic wrote:
>>> Hans and Iohannes,
>>> The following is FYI.
>>> Several months ago I integrated the close all patches before quitting
>> patch
>>> in pd-l2ork and since then I've been experiencing extremely sporadic
>> crashes
>>> on close that would hang pd-l2ork. Now, I am not sure this is because of
>>> architectural differences between regular pd and pd-l2ork but I doubt it
>>> since most of the said components are very similar if not identical.
>>> The bottom line is this only occurs on very low-powered machines (e.g.
>>> netbook) and relatively large patches and even then it does so very
>>> sporadically. Consequently, I implemented an improvement to the closing
>>> mechanism that consists of 2 additional steps and apparently alleviates
>> said
>>> problems entirely:
>>> 1) disable further redraws (this prevents calling functions that may be
>>> referencing null pointers)--I have a special global var for this which is
>>> also being used to optimize redrawing (many actions in pd-l2ork are
>> several
>>> times faster than regular pd as a result of this implementation--just
>> look
>>> for do_not_redraw call in the source if curious)
>>> 2) suspend dsp before going through the patches (all sub-patches try to
>>> suspend it and resume it but for some reason, due to asynchronous nature
>> of
>>> communication between tcl and c funny things occasionally happen on
>>> low-powered machines, so this way we ensure it is entirely off throughout
>>> the whole destruction process)
>>> Hope this helps!
>>> Ivica Ico Bukvic, D.M.A.
>>> Composition, Music Technology
>>> Director, DISIS Interactive Sound & Intermedia Studio
>>> Director, L2Ork Linux Laptop Orchestra
>>> Head, ICAT IMPACT Studio
>>> Virginia Tech
>>> Dept. of Music - 0240
>>> Blacksburg, VA 24061
>>> (540) 231-6139
>>> (540) 231-5034 (fax)
>>> ico at vt.edu
>>> http://www.music.vt.edu/faculty/bukvic/

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