This seems to correspond to similar behaviour that I experienced with
the examples too, but i didn't get around to filing a ticket yet. You
seem to have a much more clear take on it so please do.
all best
Oeyvind

2013/11/27 Francois PINOT :
> Hello devs,
>
> when modifying the end of csound6/examples/python/cb.py file like this:
>
> #time.sleep(30)
> perf.Join()
>
> and running the file, it hangs indefinitely. I looked into the
> csound6.interfaces/python_interface.i file, and I noted that the c++
> SetProcessCallback method of the CsoundPerformanceThread class is ignored by
> swig and redefined in this file (lines 417-440). It seems that the
> redefinition of the method causes the callback to run in another thread than
> the CsoundPerformanceThread instance. This could explain the indefinite
> hanging of the program.
>
> I'm actually writing a Csound API wrapper for the google go language
> (https://github.com/fggp/go-csnd6). I've translated in the go language the
> first 10 python examples for the Csound API written by Steven
> (https://github.com/kunstmusik/csoundAPI_examples). I added example13.go in
> which I show how to use the callback convenience of CsoundPerformanceThread.
> When I tried to translate my example in python I had the above issue.
>
> Should I file a ticket?
>
> Regards
>
> Francois
>
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-- 

Oeyvind Brandtsegg
Professor of Music Technology
NTNU
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Norway
Cell: +47 92 203 205

http://flyndresang.no/
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I don’t think the callback is running in a different thread, but I see that there is an issue. It might be to do with
the python GIL.

This redefinition of the callback was written by me many years ago, to allow Python functions to be used as callbacks,
and it seemed to work, but I don’t think I have used Perf.Join() at any point before, so the problem might have been there 
for a long time.

Victor
On 27 Nov 2013, at 20:35, Francois PINOT  wrote:

> Hello devs,
> 
> when modifying the end of csound6/examples/python/cb.py file like this:
> 
> #time.sleep(30)
> perf.Join()
> 
> and running the file, it hangs indefinitely. I looked into the csound6.interfaces/python_interface.i file, and I noted that the c++ SetProcessCallback method of the CsoundPerformanceThread class is ignored by swig and redefined in this file (lines 417-440). It seems that the redefinition of the method causes the callback to run in another thread than the CsoundPerformanceThread instance. This could explain the indefinite hanging of the program.
> 
> I'm actually writing a Csound API wrapper for the google go language (https://github.com/fggp/go-csnd6). I've translated in the go language the first 10 python examples for the Csound API written by Steven (https://github.com/kunstmusik/csoundAPI_examples). I added example13.go in which I show how to use the callback convenience of CsoundPerformanceThread. When I tried to translate my example in python I had the above issue.
> 
> Should I file a ticket?
> 
> Regards
> 
> Francois
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Actually, it is to do with the GIL. 
It hangs on 

 PyGILState_STATE stat = PyGILState_Ensure();

I think that bit of code makes the thread unjoinable. I am not sure right now if there is a solution apart
from not allowing python function callbacks, which is a shame.

On 27 Nov 2013, at 21:53, Victor Lazzarini  wrote:

> I don’t think the callback is running in a different thread, but I see that there is an issue. It might be to do with
> the python GIL.
> 
> This redefinition of the callback was written by me many years ago, to allow Python functions to be used as callbacks,
> and it seemed to work, but I don’t think I have used Perf.Join() at any point before, so the problem might have been there 
> for a long time.
> 
> Victor
> On 27 Nov 2013, at 20:35, Francois PINOT  wrote:
> 
>> Hello devs,
>> 
>> when modifying the end of csound6/examples/python/cb.py file like this:
>> 
>> #time.sleep(30)
>> perf.Join()
>> 
>> and running the file, it hangs indefinitely. I looked into the csound6.interfaces/python_interface.i file, and I noted that the c++ SetProcessCallback method of the CsoundPerformanceThread class is ignored by swig and redefined in this file (lines 417-440). It seems that the redefinition of the method causes the callback to run in another thread than the CsoundPerformanceThread instance. This could explain the indefinite hanging of the program.
>> 
>> I'm actually writing a Csound API wrapper for the google go language (https://github.com/fggp/go-csnd6). I've translated in the go language the first 10 python examples for the Csound API written by Steven (https://github.com/kunstmusik/csoundAPI_examples). I added example13.go in which I show how to use the callback convenience of CsoundPerformanceThread. When I tried to translate my example in python I had the above issue.
>> 
>> Should I file a ticket?
>> 
>> Regards
>> 
>> Francois
>> ------------------------------------------------------------------------------
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>> organizations don't have a clear picture of how application performance 
>> affects their revenue. With AppDynamics, you get 100% visibility into your 
>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
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>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
> 
> 
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I am wondering if there is a way to find out whether we are in the main thread or not, and avoid the call that hangs.
On 27 Nov 2013, at 22:16, Francois PINOT  wrote:

> Just read this: http://docs.python.org/2/c-api/init.html. I'm afraid you're right. So the conclusion is: do not use the callback process mechanism of CsoundPerformanceThread python wrapper along with the  CsoundPerformanceThread.Join method. In that case use a time.Sleep() to wait for the end of the thread instead...
> 
> 
> 2013/11/27 Victor Lazzarini 
> Actually, it is to do with the GIL.
> It hangs on
> 
>  PyGILState_STATE stat = PyGILState_Ensure();
> 
> I think that bit of code makes the thread unjoinable. I am not sure right now if there is a solution apart
> from not allowing python function callbacks, which is a shame.
> 
> On 27 Nov 2013, at 21:53, Victor Lazzarini  wrote:
> 
> > I don’t think the callback is running in a different thread, but I see that there is an issue. It might be to do with
> > the python GIL.
> >
> > This redefinition of the callback was written by me many years ago, to allow Python functions to be used as callbacks,
> > and it seemed to work, but I don’t think I have used Perf.Join() at any point before, so the problem might have been there
> > for a long time.
> >
> > Victor
> > On 27 Nov 2013, at 20:35, Francois PINOT  wrote:
> >
> >> Hello devs,
> >>
> >> when modifying the end of csound6/examples/python/cb.py file like this:
> >>
> >> #time.sleep(30)
> >> perf.Join()
> >>
> >> and running the file, it hangs indefinitely. I looked into the csound6.interfaces/python_interface.i file, and I noted that the c++ SetProcessCallback method of the CsoundPerformanceThread class is ignored by swig and redefined in this file (lines 417-440). It seems that the redefinition of the method causes the callback to run in another thread than the CsoundPerformanceThread instance. This could explain the indefinite hanging of the program.
> >>
> >> I'm actually writing a Csound API wrapper for the google go language (https://github.com/fggp/go-csnd6). I've translated in the go language the first 10 python examples for the Csound API written by Steven (https://github.com/kunstmusik/csoundAPI_examples). I added example13.go in which I show how to use the callback convenience of CsoundPerformanceThread. When I tried to translate my example in python I had the above issue.
> >>
> >> Should I file a ticket?
> >>
> >> Regards
> >>
> >> Francois
> >> ------------------------------------------------------------------------------
> >> Rapidly troubleshoot problems before they affect your business. Most IT
> >> organizations don't have a clear picture of how application performance
> >> affects their revenue. With AppDynamics, you get 100% visibility into your
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> >
> >
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> 
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