Re: Running simulation > 10Hz

On Tue, Apr 23, 2013 at 4:15 AM, ulle <[email protected]> wrote:

> The push mode did the trick!
> Thank you, Rich. I really appreciate it.
>
> I use Read() instead of ReadIfWaiting(). Using the latter it reads the same
> data like crazy before getting fresh data while Read() is called four or
> five times in my case before fresh data is available. I guess
> ReadIfWaiting() should read if there is a message in the queue, but I get
> the same data over and over again. Do I need to somehow remove data from
> the
> server after I have read it?
>
> Thanks again,
> /U
>
> ReadIfWaiting() is a non-blocking read; it checks to see if the client has
received any new information from the server since the last read.  If it
hasn't, the call comes back without doing anything.  Read() blocks until at
least one message is read from the Player server.

You don't constantly receive the same data over again; you can think of the
client libraries as buffers.  Each client proxy stores the data from the
latest message it has received from the Player server.  Calls to Read()
don't necessarily update every client proxy, as your client may not have
received a new message since the last call to Read().  So those clients
will continue to store the same data after a call to Read().

One way to check if a particular client proxy got a new message is by using
the IsFresh()/NotFresh() set of calls in the PlayerC++ library.  Each time
that Read() *does* update a particular client, it sets that client's
"Fresh" flag to true.  After a call to read, you can check each of your
proxies for the Fresh flag to see if there has been an update.  Then you
can call NotFresh() to reset the fresh flag and signify that the data is
stale/you've already done something with it.  The example program I sent in
this thread uses this method to only print each message's timestamp once.


Rich

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