<div>On 7/10/07, Jussi Kukkonen <<a href="mailto:jhkukkon@cc.hut.fi">jhkukkon@cc.hut.fi</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I've been playing with the gps backend for a while now, and have some comments / questions: First, I just couldn't get my gps (Nokia LD-3W) to work with the current gps backend: geoclue_position_current_position() calls gps_query to get coordinates, but my device requires 10-60 such calls before it gets a fix and starts answering with coordinates. I've understood this is normal for gps devices -- gps data should in general be read using a callback (and waiting until there's actual data). Plan:    * I'll implementing geoclue_position_current_position_changed-signal      using gps_set_callback internally (it uses POSIX threading, I      assume that's ok?)</blockquote><div> This is a good idea and should be the prefered method of getting a Signal.  </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">   * current_position should probably use the same gps callback      internally, but dbus timeout may be a problem if geoclue waits for      an actual position before returning... I wonder if asynchronous      method calls have a timeout in dbus?</blockquote><div> current_position shouldn't be asynchronous.  If it does not have the position it should return that it doesn't and then the application should listen for the signal of position changed.  </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Second, I'm going to add some code to use libgpsbt and libgpsmgr when present (they take care of of e.g. starting and stopping gpsd as needed to preserve resources). At the moment this is maemo specific, but I assume other mobile linux systems will use them too (it has been discussed on the  openmoko list at least), so I'd like to put the changes in geoclue proper. My solution was this, please suggest better ones if this is suboptimal:    * use AC_CHECK_LIB in <a href="http://configure.ac">configure.ac</a> to define HAVE_LIBGPSBT      if the lib is there    * use "#ifdef HAVE_LIBGPSBT" in gps backend code when I want to      call the library Any comments?</blockquote><div> This sounds fine as long as it is an optional dependency.  </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">  -jussi _______________________________________________ GeoClue mailing list <a href="mailto:GeoClue@lists.freedesktop.org">GeoClue@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/geoclue">http://lists.freedesktop.org/mailman/listinfo/geoclue</a> </blockquote></div>