Re: [pyusb-users] How to handle Solaris's strange library location?

[Wander L. C. <wan...@gm...>]

2015-04-27 22:01 GMT-03:00 Chapman Flack <gh...@an...>:
> Hi,
>

Hi,

> I recently sent a patch so the ctypes structures would have
> the right sizes on Solaris (thanks for merging!), but I was
> not sure what would be the best way for the libusb0 backend
> to handle the strange location of the shared object on Solaris.
> It's /usr/sfw/lib/libusb.so.1
>
> Should that name just be added to the big list o' names already
> in libusb0.py _load_library()? Or check for sys.platform == 'sunos5'
> and define a different _load_library that knows the right path? Or
> some other approach?
>

Sorry, you commented this in the patch and I completely forgot to answer it.
I think the simplest solution would be to add it to the list of candidates.

> I also recently saw this blog post here:
> http://emergent.unpythonic.net/01330399156
>
> where somebody wrote a C port of a Python script that was
> using pyusb because it was too slow. The post says that the
> compiler, objdump, and ldconfig were getting run when the Python
> script started up. I don't see that when I run it (same script,
> but I modified it to pass a find_library lambda that just returns
> the Solaris library path). So maybe the only time those expensive
> external processes get run are during the library search? In that
> case, maybe it's good to hardcode the path when known ... or fall
> back to the expensive way if the hardcoded path isn't found.
>

He doesn't necessarily need to rewrite the app in C, but he can write
a faster backend.
I am not worried about optimization right now, but guessing common
paths seems like a smart and simple optimization.

> -Chap
>
> ------------------------------------------------------------------------------
> One dashboard for servers and applications across Physical-Virtual-Cloud
> Widest out-of-the-box monitoring support with 50+ applications
> Performance metrics, stats and reports that give you Actionable Insights
> Deep dive visibility with transaction tracing using APM Insight.
> http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
> _______________________________________________
> pyusb-users mailing list
> pyu...@li...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users



-- 
Best Regards,
Wander Lairson Costa