On 09. juni 2014 12:59, Carsten A. Arnholm wrote:> Hi,
>
> I am trying to use cxxtools::net::UdpReceiver on Raspberry PI to
> receive messages. I am currently doing this in a loop that should
> not be interrupted. It works, but too slowly.
>
> Right now I am calling poll() on the UdpReceiver object with a zero
> timeout value, it throws an exception when there is no data. This
> takes too long, it seems.
I tried the same without calling poll, just calling recv()
It turns out it is also throwing an exception when there is no data in
the queue and the timeout is reached. From my measurements it takes
about ~0.05 ms to do the call when there is data, but ~0.3ms when there
is not, about 6 times longer. I guess it has to do with an exception
being thrown. I would in this case much prefer if an exception was not
thrown, and instead the size returned would simply be 0, assuming it
would be much faster.
I can see that recv has a "flags" parameter, but it is not documented
size_type cxxtools::net::UdpReceiver::recv( void* buffer,
size_type length,
int flags = 0);
So, is there a way to call recv (or any equivalent function) that will
not throw exception, but will tell me in a cheap way if there is data in
the message queue?
Regards
Carsten Arnholm
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