[libcamera-devel] [PATCH 4/4] tests: event-dispatcher: Add processEvents() interruption test

[Laurent Pinchart]

Hi Kieran,

On Wed, Jan 23, 2019 at 11:50:57AM +0000, Kieran Bingham wrote:
> On 23/01/2019 08:59, Laurent Pinchart wrote:
> > Test that the EventDispatcher::interrupt() function correctly interrupts
> > the processEvents() function, both when called before processEvents()
> > and when called while it is running.
> > 
> 
> LGTM
> 
> Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
> 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> 
> While testing this, it occurs to me - is there any way we can call into
> the Logger instance from an application (or specifically a *test*
> application) to raise the default log level to DEBUG?
> 
> It's about the only time where I'd want LIBCAMERA_LOG_LEVELS=*:DEBUG by
> default.
> 
> I tried adding a call to putenv("LIBCAMERA_LOG_LEVELS=*:DEBUG"); in
> Test::init(); but of course this only gets executed after the static
> Logger->instance() is already created.
> 
> 
> I wonder if we might expose a static method on the internal Logger()
> instance so that we can call
> 
>    libcamera::Logger::SetLogLevel(Debug);
> 
> Only an idea... and not directly related to this patch, so don't put too
> much thought into it just yet.

I think should would make sense, possibly even exposed by the
CameraManager class as non-test applications could have a use for this.
Patches are welcome :-) We need to think about the API though, as we may
want to enable per-category log level control (that doesn't have to be
included in the code, but needs to be considered to design the API).

> > ---
> >  test/event-dispatcher.cpp | 32 +++++++++++++++++++++++++++++++-
> >  1 file changed, 31 insertions(+), 1 deletion(-)
> > 
> > diff --git a/test/event-dispatcher.cpp b/test/event-dispatcher.cpp
> > index 06c2657f09d6..e8818dcab4ad 100644
> > --- a/test/event-dispatcher.cpp
> > +++ b/test/event-dispatcher.cpp
> > @@ -18,16 +18,23 @@
> >  using namespace std;
> >  using namespace libcamera;
> >  
> > +static EventDispatcher *dispatcher;
> > +static bool interrupt;
> > +
> >  class EventDispatcherTest : public Test
> >  {
> >  protected:
> >  	static void sigAlarmHandler(int)
> >  	{
> >  		cout << "SIGALARM received" << endl;
> > +		if (interrupt)
> > +			dispatcher->interrupt();
> >  	}
> >  
> >  	int init()
> >  	{
> > +		dispatcher = CameraManager::instance()->eventDispatcher();
> > +
> >  		struct sigaction sa = {};
> >  		sa.sa_handler = &sigAlarmHandler;
> >  		sigaction(SIGALRM, &sa, nullptr);
> > @@ -37,7 +44,6 @@ protected:
> >  
> >  	int run()
> >  	{
> > -		EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher();
> >  		Timer timer;
> >  
> >  		/* Event processing interruption by signal. */
> > @@ -48,6 +54,7 @@ protected:
> >  
> >  		struct itimerval itimer = {};
> >  		itimer.it_value.tv_usec = 500000;
> > +		interrupt = false;
> >  		setitimer(ITIMER_REAL, &itimer, nullptr);
> >  
> >  		dispatcher->processEvents();
> > @@ -62,6 +69,29 @@ protected:
> >  			return TestFail;
> >  		}
> >  
> > +		/* Event processing interruption. */
> > +		timer.start(1000);
> > +		dispatcher->interrupt();
> > +
> > +		dispatcher->processEvents();
> > +
> > +		if (!timer.isRunning()) {
> > +			cout << "Event processing immediate interruption failed" << endl;
> > +			return TestFail;
> > +		}
> > +
> > +		timer.start(1000);
> > +		itimer.it_value.tv_usec = 500000;
> > +		interrupt = true;
> > +		setitimer(ITIMER_REAL, &itimer, nullptr);
> > +
> > +		dispatcher->processEvents();
> > +
> > +		if (!timer.isRunning()) {
> > +			cout << "Event processing delayed interruption failed" << endl;
> > +			return TestFail;
> > +		}
> > +
> >  		return TestPass;
> >  	}
> >  

-- 
Regards,

Laurent Pinchart