[PD] pd-lork and midi on osX

[Dan Wilcox]

That sounds about right, yeah. That matches other issues people have brought up that highlight sending MIDI is affected by the block size.

> On May 4, 2019, at 2:31 AM, Christof Ressi <christof.ressi at gmx.at> wrote:
> 
>> from what I understand portmidi uses a lockfree ringbuffer so sending a lot of MIDI messages shouldn't block Pd.
> 
> I was wrong, the lockfree ringbuffer is only used for *receiving* MIDI messages. looking at pmwinmm.c, sending MIDI messages certainly involves blocking operations. I think the midi_outqueue should be read by a seperate worker thread.
> 
> Christof
> 
>> Gesendet: Samstag, 04. Mai 2019 um 00:23 Uhr
>> Von: "Christof Ressi" <christof.ressi at gmx.at>
>> An: "Dan Wilcox" <danomatika at gmail.com>
>> Cc: Pd-List <pd-list at lists.iem.at>
>> Betreff: Re: [PD] pd-lork and midi on osX
>> 
>> thanks! FWIW, I also get the blocking behavior on Pd 0.46 - 0.49 (Windows) and also on Pd extended, so at least on Windows this has always been a problem. Cyrill only said that it worked on Pd extended but he didn't say anything about older Pd vanilla releases. You've done some macOS specific changes in portmidi/portmidi/pm_mac/pmmacosxcm.c but afaict it's only about *receiving* MIDI messages. So actually I don't think that you've introduced a regression here.
>> 
>> note that when I turn on Cyrill's test patch, audio output is completely blocked and the GUI lags. from what I understand portmidi uses a lockfree ringbuffer so sending a lot of MIDI messages shouldn't block Pd. the patch itself doesn't show a significant CPU increase, it's just blocking unnecessarily.
>> 
>> since it seems to affect both Windows and macOS but not Linux (as Cyrill has noted, I didn't check), we should probably look at the portmidi part.
>> 
>> Christof
>> 
>> Gesendet: Freitag, 03. Mai 2019 um 23:31 Uhr
>> Von: "Dan Wilcox" <danomatika at gmail.com>
>> An: "Christof Ressi" <christof.ressi at gmx.at>
>> Cc: Pd-List <pd-list at lists.iem.at>
>> Betreff: Re: [PD] pd-lork and midi on osX
>> 
>> https://github.com/pure-data/pure-data/pull/214
>>  
>> 
>> On May 3, 2019, at 11:29 PM, Christof Ressi <christof.ressi at gmx.at[mailto:christof.ressi at gmx.at]> wrote: 
>> 
>> hey, can you point me to your changes?
>>   
>> 
>> --------
>> Dan Wilcox
>> @danomatika[http://twitter.com/danomatika]
>> danomatika.com[http://danomatika.com]
>> robotcowboy.com[http://robotcowboy.com]
>>  
>> 
>> 
>> 
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--------
Dan Wilcox
@danomatika <http://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>



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