I have tested python importing csnd on OSX and I could
run a script that Istvan suggested, and I got to play Trapped
alright. So that bit works. And if CsoundVST (lib) is built as a bundle,
I'd say it would also run OK, although I have not tested it.

As the code is at the moment, if CsoundVST (app) tries to load, as
a python interpreter, bundle containing a copy of the same object
code in CsoundVST (lib), then there will be two different instances
of csound in memory. CsoundVST crashes, but the crash might
be unrelated to that. So if you were to load the csnd module from
a python interpreter in CsoundVST, you might get the same problem.

So it is possible that a CsoundVST without python will work OK. I'm not
sure how you would want to provide this, but to me it seems that if
you want to work with python and algorithmic composition, you
can do it from python by importing csnd and the algorithmic composition
module. That would work on OSX. And if you want VST plugin and frontend,
then you just run CsoundVST.

Victor

At 16:46 27/10/2005, you wrote:
>My plan is for CsoundVST to load and use the csnd module as one Python 
>extension, and the Silence algo-comp classes as another Python extension 
>module. But, I may simply drop the Python support from CsoundVST and let 
>it be purely a VST plugin. I prefer to code and compose in a Python code 
>editor anyway.
>
>So, do you think it would work to run Csound from Python importing "csnd" 
>on OS X?
>
>Thanks,
>Mike
>
>-----Original Message-----
>From: Victor Lazzarini 
>Sent: Oct 27, 2005 11:03 AM
>To: csound-devel@lists.sourceforge.net
>Subject: [Cs-dev] OSX CsoundVST issues
>
>| At 15:31 27/10/2005, you wrote:
>| What would need to be changed to build and run it on OS X?
>
>I'm still looking at it, but I think the problem lies in the
>way the same dynamic lib is used twice in the program. In other
>systems, this is not a problem as the same type of dynamic lib
>is used as an ordinary shared library and a loadable module.
>
>The problem on OSX lies in the fact that, and that seems to be
>a python-specific issue, python loadable modules are bundles,
>and not shared libs.
>
>There is no way that the same file can be used as a python module
>and a dynamic-link library. So I tried creating two: this  generates two
>separate instances of csound. Then, as Istvan suggested, I tried
>linking the bundle to the dynamic library: python can't find the
>entry point. Finally, moved the wrapper object code to the bundle
>from the dynamic library. Now python can see the entry point,
>but CsoundVST crashes. Gdb tells me that the program
>received EXC_BAD_ACCESS, could not access memory (in
>__dynamic_cast()).
>
>When running python and then loading the module, gdb tells me
>it is stuck in _semaphore_wait_signal_trap().
>
>So I am not sure now, given what gdb is telling me, what problems
>are there. But one thing is sure, the wrapper code works, because
>if I build a bundle with all the csoundVST sources statically in it,
>the module loads OK in Python.
>
>I noticed that System.cpp was throwing a lot of warnings. One of them
>was a linking problem of symbol redefinition (basename(), which is
>found in libpthread and I renamed to basename_(), but that did not
>change anything).
>
>The answer to your question is probably I don't know. However,
>you could consider making a CsoundVST program that is not a
>python module, since there is now a python module in _csnd.so.
>I'm not sure it would be what you want, though.
>
>Victor
>
>
>
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Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth 



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