Re: [Playerstage-users] old data being read into proxy

[Martin S. <mar...@gm...>]

With just this in the config file I get the same result:

driver
(
  name "dummy"
  provides ["position2d:0"]
  rate 75
)

Martin

2009/8/5 Toby Collett
<tco...@pl...<tcollett%2Bp...@pl...>
>

>
> Are you able to reproduce this with a minimal configuration that requires
> only standard stage, or a standalone driver you can attach?
>
> Toby
>
> 2009/8/2 Martin Spencer <mar...@gm...>
>
> > Hi everyone,
> >
> > I'm using the C++ client library with the trunk version of player. When I
> > set the client to pull mode with replacement, I'm finding that the data
> read
> > into the proxies is sometimes old data. I think this is because each call
> to
> > client.Read() only reads until it gets a synch message but something is
> > sending synch messages when not requested. This example demonstrates the
> > problem:
> >
> >     PlayerClient* robot;
> >     robot = new PlayerClient("localhost", 6665);
> >     robot->SetDataMode(PLAYER_DATAMODE_PULL);
> >     robot->SetReplaceRule(true, PLAYER_MSGTYPE_DATA);
> >     js = new Position2dProxy(robot,0);
> >     sleep(1);
> >     double start = Time()/1e6;
> >     for(;;) {
> >         js->NotFresh();
> >         robot->Read();
> >         cout<<"fresh: "<<js->IsFresh()<<" datatime:
> > "<<js->GetDataTime()-start<<" actual time: "<<Time()/1e6-start<<endl;
> >         usleep(200000);
> >     }
> >
> > Output when the above code is run, with a joystick publishing data much
> > faster than once every 0.2s:
> > fresh: 1 datatime: -0.984458 actual time: 0.00039901
> > fresh: 1 datatime: -0.00469089 actual time: 0.201128
> > fresh: 1 datatime: 0.199529 actual time: 0.401752
> > fresh: 1 datatime: 0.393163 actual time: 0.602395
> >
> > It looks like the data that's read into the proxy is that data that was
> > received by the previous call to Read(), not the current one.
> >
> > Adding these two lines at line 708 of client.c seems to fix the problem
> by
> > checking for any data already waiting before we request more:
> >
> >      if(client->mode == PLAYER_DATAMODE_PULL)
> >          playerc_client_read_nonblock_withproxy(client, &ret_proxy);
> >
> > But then I sometimes get errors where no data was received with a synch
> > message.
> >
> > Any ideas?
> >
> > Martin Spencer
> >
> >
> >
> >
> >
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