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Re: Code execution context



We currently require support for a minimum of boost 1.59 due to Linux
distros lagging behind. boost/beast is not a viable option as beast did not
appear in boost until 1.66.

>From some offhand sounding out we may be able to bump the minimum to 1.65
but that doesn't help :/


On Thu, Feb 25, 2021 at 9:00 AM Jon Evans <jon@xxxxxxxxxxxxx> wrote:

> Hello Markus,
> This is exciting news, as some of our users are also big fans of
> 3dconnexion products[1]
> Others have looked in to what it would take in the past, but there were
> some questions about the need for proprietary drivers on some platforms[2]
> It sounds like this websocket interface is a new approach that doesn't
> require any additional libraries for KiCad to link against?
> Does the hardware use some other daemon process to bridge between the
> device driver and websockets?
> As you may know, KiCad uses wxWidgets as a framework, so you probably want
> to plug in to the wx event loop on the main thread.
> There are some guidelines on this in their docs[3].
> You probably want to check out ./common/view/wx_view_controls.cpp to see
> how existing input events are handled by the 2D canvases.
> I guess your new code would hook in here somewhere, and provide additional
> event handlers to manage the data from the 3D device.
> Your communication thread should be able to post wxWidgets events to the
> main thread and then we can consume them here.
> By the way: although the wx docs use wxThread, I think this general
> concept should work with C++ standard libraries threads just fine.
> The documentation for wxEvtHandler::QueueEvent may also be useful[4]
> Hope this helps!
> Best,
> Jon
> [1] https://gitlab.com/kicad/code/kicad/-/issues/4951
> [2] https://lists.launchpad.net/kicad-developers/msg29464.html
> [3]
> https://wiki.wxwidgets.org/Inter-Thread_and_Inter-Process_communication#Sending_events_to_the_main_thread_-_wxWidgets_3_only
> [4]
> https://docs.wxwidgets.org/3.0/classwx_evt_handler.html#acffd03bf407a856166ea71ef0318b59a
> On Thu, Feb 25, 2021 at 1:47 AM Markus Bonk <markus_bonk@xxxxxxxxxxxxxxx>
> wrote:
>> Hi,
>> I am currently investigating adding support for 3D input devices to
>> pcbnew. The plan is to use a websocket interface (boost/beast) to
>> communicate with the 3D device. Effectively the communication runs on an
>> extra thread. Somewhere the event code will need to switch to executing on
>> the main thread.
>> One way of achieving this on say win32 might be to add functors to a
>> queue post a message to a message window handler in the main thread which
>> empties the queue and invokes the functor.
>> Is such a mechanism already in place in KiCAD? What is the KiCAD
>> recommended solution to the issue?
>> Thanks
>> -Markus
>> ------------------------------
>> *Markus Bonk*
>> Senior Software Engineer
>> Clarita-Bernhard-Str. 18
>> 81249 München
>> Germany
>> markus_bonk@xxxxxxxxxxxxxxx <%7BE-mail%7D>
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