Re: [libdc] use of fileno to implement timeout

[David M. <dcm@MIT.EDU>]

I've gotten it to work for sure in the past.  I have a couple questions:

1. Exactly how is it failing?  Is the select never returning?  Always
returning immediately, or something else?

2. Are you using juju or the raw1394 backend of libdc1394?  Which
distribution are you running?

3. Does capture work correctly when not using select()?

4. Which version of the library are you using?  SVN head, or one of the
release candidates?

I did notice one bug in your code:  I think you are only calling FD_SET
once.  However, you need to call this before every invocation of
select(), since prior invocations of select() may zero out the fd_set if
the select() returns due to timeout, for example.

-David


On Mon, 2007-11-19 at 20:27 -0800, Andrew Straw wrote:
> Hi,
> 
> I have tried, unsuccessfully, to use a fileno [returned by
> dc1394_capture_get_fileno()] to listen for new frames, and timeout
> otherwise, by using select() on linux (2.6.20 and 2.6.22). Is anyone
> willing to share some example code where this works?
> 
> My implementation attempts are at
> http://code.astraw.com/projects/motmot/browser/trunk/cam_iface/src/cam_iface_dc1394.c
> , in particular in the CamContext_grab_next_frame_blocking_with_stride()
> function, where select() is called -- currently commented out. (I plan
> on announcing this library more widely at some point...)
> 
> Thanks,
> Andrew
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> Mailing list for libdc1394-devel
> lib...@li...
> https://lists.sourceforge.net/lists/listinfo/libdc1394-devel