Hi Boris,
I have a similar problem with running a Qt application from a second
thread. In my case it segfaulted after QApplication::app.
Christian gave me a hint I wasn't able to try yet, but maybe it could be
helpful for you, too.
On Mon, Oct 16, 2017 at 01:42:04PM +0200, Johannes Kliemann wrote:
I tried to create a provide an input session from a libc (in this case
an Qt application). If I just run it from the Main struct it will
correctly announce the session but since Main never returns, no client
will be able to use it.
I tried to circumvent this by putting the application into a separate
thread but this led to the following error:
Error: void Libc::Kernel::run(Libc::Application_code&) called from non-kernel
context
Running this Qt application without wrapping it into with_libc makes it
segfault on initialization.
What is the correct way to do this? My current main is at [1].
Unfortunately, there is no "correct" way of implementing tasks like
the described currently. I must admit that with_libc() is the most
confusing function in Genode currently and we therefore will remove it
from the API soon. In fact, I myself did not expect that with_libc()
is needed in your context but there may be dependencies unknown to me.
I'd suggest a careful look into libports/src/app/avplay which provides
an input session too. The approach there is to create a second Genode
entrypoint for the input service and execute Qt code in the component
thread. I strongly encourage you not just to copy the avplay code as
it uses the older, low-level Rpc_entrypoint but use
Genode::Entrypoint.
Regards,
Johannes
On 10/23/17 15:51, Boris Mulder wrote:
Dear Genode folks,
I have built an application with Qt5. I want it to also be able to read
ROM modules from a report_rom server and to be able to handle updates to
that ROM using signals.
When I run QApplication::exec() however, it does not return and the
entrypoint cannot listen to signals, causing them to be ignored.
So I created another QThread and run my QApplication in there. Now I get
the following error:
WARNING: QApplication was not created in the main() thread.
And the application does not do anything and does not react to events.
What can I do to be able to run both the qt event loop and the genode
event loop?
regards,
Boris
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