OpenEuphoria

Re: Rob: More trouble with PD-source

• Posted by Vincent <darkvincentdude at yahoo.com> Nov 29, 2005
• 699 views

Robert Craig wrote:
> 
> Elliott Sales de Andrade wrote:
> > I can confirm that without the StatusProc, the example does work correctly.
> > Speed is somewhat important in these cases since audio buffering is
> > involved.
> > The DSPTest, for example, is machine-staggeringly slow when run through the
> > PD source. Still, it is able to run without crashing, albeit quite slowly.
> > However,
> > I do not think speed is as important in the StatusProc since it is meant for
> > saving downloaded data.
> 
> I just tried a little experiment with NetRadio.exw.
> If I add a small delay:
>    for i = 1 to 1000 do
>    end for
> before returning from the callback, exw runs NetRadio ok.
> But if I increase the loop to 10,000 ... 100,000 ... 1,000,000
> then things become unstable, and eventually it crashes with
> one of those weird errors. So there is a problem if the callback 
> takes too long, and maybe also if other processing takes too long. 
> I'm guessing the PD source (exw eu.ex) is too slow for certain 
> demanding operations. It doesn't crash when it's simply displaying
> a GUI. It's when some data is being transferred at high-speed.
> I think your BASS stuff is requiring a minimum level of speed.
> 

It crashes with different random errors each time I click a button in
NetRadio.exw, with EXW and trace(3).

Can you do anything about this?

> > It may well be that Eu's lack of thread-safety is the cause of this problem.
> > However, I do not know why it would still work with the official
> > interpreter.
> > The errors are quite random. Sometimes, only half an error message is
> > printed,
> > without the actual error showing up, even in the ex.err file. This is
> > sometimes
> > a sign of the problem with thread-safety, but I cannot confirm it.
> 
> If you run multiple threads in a non-thread-safe environment,
> corruption can happen. For example, if two threads are
> allocating space from the same heap at the same time, the
> heap could get corrupted and all hell could break loose,
> causing the interpreter to behave in a totally insane way.
> 

Elliott could probably use TDLL in these cases. A Linux and BSD port of this
library would be nice.

> Regards,
>    Rob Craig
>    Rapid Deployment Software
>    <a href="http://www.RapidEuphoria.com">http://www.RapidEuphoria.com</a>


Regards,
Vincent