Re: [gpsd-dev] Minimum working example for libgps

[Eric S. Raymond]

David Huichen Dai <address@hidden>:
> ​Thanks for your reply. Why do you say that my sensor reports at 1-second
> interval?

Because that's what the hardware does, unless you have one of the rare and more
expensive devices with a shorter cycle.  

>​I set the gps_waiting time to 2 seconds, which means I wait for
>up to 2 seconds to get the coordinates, not sampling every 2 seconds, right?

Correct.

> Do I need a separate thread to sample the coordinates, store them in a
> variable, and access it from other thread when I need the coordinates? Is
> this the common way to use the libgps?

That depends entirely on what other kinds of events your application waits on.
Some applications are best written as a simple blocking loop - especially
if they're simple noninteractive report generators.  On the other hand, if
you ever wait on a keystroke, having a separate capture thread is probably
a good idea so that your socket buffer doesn't fill up and look to gpsd
like a dead device.  It will drop the client connection when that happens.
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                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

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