Does the Csound instance
creation happen in a separate thread? Then it might
a problem of thread synchronisation. Either csound
is not yet completely created or you are trying to
access the CSOUND dataspace at the same time from
two threads and they are interfering. You can try using
locks to synchronise access, if that's the problem.

Victor

>
> > 1. is csoundthread::csound created properly?
> Yes, at least everything else runs fine when I comment out
> my  ..setCsoundCallback()
>
> > 2. is it a public member of the class?
> Yes.
>
> > 3. Does the violation happen at the call to
> ..setCallback()? Or  >is it when the callback is  first
> invoked by csound?
>
> Mmm, I just tried to find this out and I noticed that if I
> put a  Sleep(100) just before I call
> CsoundSetMessageCallback() it runs fine,  messages and
> everything. Any ideas? I don't mind a slight pause before
> execution.
>
> Rory.
>
>
>
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> Does the Csound instance  creation happen in a separate thread?

Yes. I think as you said it's a case of Csound not being fully created 
when I call my message function. I will try to clean it up. Having a 
slight pause is not too much of a problem anyhow, but it will make 
things a little more elegant if I tidy them up now. Cheers,
Rory.


Then it might
> a problem of thread synchronisation. Either csound
> is not yet completely created or you are trying to
> access the CSOUND dataspace at the same time from
> two threads and they are interfering. You can try using
> locks to synchronise access, if that's the problem.
> 
> Victor
> 
> 
>>>1. is csoundthread::csound created properly?
>>
>>Yes, at least everything else runs fine when I comment out
>>my  ..setCsoundCallback()
>>
>>
>>>2. is it a public member of the class?
>>
>>Yes.
>>
>>
>>>3. Does the violation happen at the call to
>>
>>..setCallback()? Or  >is it when the callback is  first
>>invoked by csound?
>>
>>Mmm, I just tried to find this out and I noticed that if I
>>put a  Sleep(100) just before I call
>>CsoundSetMessageCallback() it runs fine,  messages and
>>everything. Any ideas? I don't mind a slight pause before
>>execution.
>>
>>Rory.
>>
>>
>>
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> 
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>>https://lists.sourceforge.net/lists/listinfo/csound-devel
> 
> 
> 
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Cheers, I think setting the callback in the thread is the easiest for now.

Rory.

Istvan Varga wrote:
> On Thursday 19 January 2006 21:14, Rory Walsh wrote:
> 
> 
>>>Does the Csound instance  creation happen in a separate thread?
>>
>>Yes. I think as you said it's a case of Csound not being fully created 
>>when I call my message function. I will try to clean it up. Having a 
>>slight pause is not too much of a problem anyhow, but it will make 
> 
> 
> Instead of the pause, you could wait on a lock that is signaled by
> the Csound thread, or just set the callback in the Csound thread.
> 
> 
> 
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