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[10:01] <agronholm> finally
[10:01] <agronholm> took me so many hours to figure this out...why my signal handler was not being called
[10:02] <agronholm> http://pastebin.com/9Ld4kwGZ
[10:03] <agronholm> as an exercise to readers: why does it print 'task started' only with wrapper1 but not wrapper2?
[10:03] <agronholm> I know the answer now, but free internets to those who guess correctly :)
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[10:16] <mrud> agronholm: not sure but maybe no reference for task and therefore it gets removed before it gets executed?
[10:17] <agronholm> before what exactly gets executed?
[10:18] <agronholm> InlineTask.run() and BackgroundTask.run() are both executed with both wrappers
[10:19] <agronholm> but the handleTaskStarted() signal handler is not executed with wrapper2
[10:19] <mrud> agronholm: yeah but it will only get executed after app.exec_()
[10:19] <mrud> ?
[10:19] <agronholm> yes
[10:19] <mrud> but i am probably wrong
[10:19] <agronholm> what was your theory then?
[10:20] <agronholm> my reasoning yesterday was that a connected signal handler would keep the InlineTask from being garbage collected
[10:20] <mrud> i think the problem is that the threads/tasks are only started afterapp.exec_()
[10:21] <agronholm> that is not the problem
[10:21] <agronholm> the problem is that Qt does not keep strong references to the signal handlers
[10:21] <agronholm> so Qt notes that the weak reference is invalid and thus does not execute the signal handler
[10:22] <agronholm> with wrapper 1 the InlineTask instance is stored on the module level so the weak reference is still valid when Qt calls the signal handler
[10:22] <agronholm> took me better part of the day (and yesterday) to come to this conclusion
[10:23] <agronholm> I assumed Qt would keep a strong reference to the handler because that is what Swing (Java) does (I do a fair bit of GUI programming with Swing)
[10:24] <agronholm> but that is not the case
[10:24] <mrud> i think i once had a similar issue
[10:24] <agronholm> it was hard to debug because Qt is essentially a black box where with swing you could dive into the internals with the debugger and figure it out yourself
[10:25] <agronholm> mrud: what kind of issue
[10:26] <mrud> agronholm: i had to keep a reference to a field or something with qt otherwise i wouldn't get a notification
[10:27] <agronholm> yeah, exactly the same problem then
[10:27] <mrud> but i don't remember the details, basically it's the same issue
[10:29] <mrud> agronholm: but it was a long time ago...i don't do much gui stuff
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