Re: SMB module and do_get_file_info

[Nate Nielsen <nielsen-list memberwebs com>]

Philippe Normand wrote:
> I'm now playing with the Python gnomevfs package. But having issues with
> gnomevfs.exists, see the attached code. When looking up for a SMB uri
> pointing to a dead machine, the whole python process is locked and i don't
> understand why.
> 
> So I came up to wonder why the do_get_file_info() function takes so much
> time to resolve SMB uris which don't exist.
> 
> Tracing my code, it seems to block on the LOCK_SMB() in do_get_file_info()
> function, but i really can't figure out why it locks my everything. In the
> gnome-python binding, the GIL seems to be well used.

libsmbclient is not thread safe, and only allows one request to be
active at a time. So each request has to be serialized, and that's what
LOCK_SMB() does. What's likely is that another previous request is in
running in libsmbclient at that point in time.

That said, it may also be a bug. I'd suggest editing
modules/smb-method.c and remove the '#if 0' around the DEBUG_SMB_ENABLE
and DEBUG_SMB_LOCKS defines, and recompile. You should then get copious
output that'll help one trace the various requests through the module.

Cheers,
Nate