runtime error and QFuture
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wrote on 12 Feb 2018, 08:43 last edited by
Hello guys. I am still learning Qt C++ and I have a lot of code, so I will try and explain my problem in point form as best as I can. Please bear with me.
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I have two objects of a class.
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From my MainWindow.cpp i connect signals and slots to these two objects functions, where data is processed and results are emitted back to my main MainWindow.
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Two QFutures are created using each of those class objects. They are ran by using QFuture<void> futureEg1 = QtConcurrent::run( &object, &ClassName::function, args...)
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All is good till this point, I am able to process my data and retrieve it in my main thread for both objects.
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At the moment, in my main thread's slot that receives the data, I am only qDebugging the results. No modifications or other access, as I'm afraid of data being unsynchronised or something?
Is there be a problem when two signals emit the same slot at the same time in my main thread, as I have encountered a runtime error.
Thanks and if you need me to clarify or show the relevant parts of the code, anything I will most definitely do so. Your help is of utmost appreciation!
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Hello guys. I am still learning Qt C++ and I have a lot of code, so I will try and explain my problem in point form as best as I can. Please bear with me.
-
I have two objects of a class.
-
From my MainWindow.cpp i connect signals and slots to these two objects functions, where data is processed and results are emitted back to my main MainWindow.
-
Two QFutures are created using each of those class objects. They are ran by using QFuture<void> futureEg1 = QtConcurrent::run( &object, &ClassName::function, args...)
-
All is good till this point, I am able to process my data and retrieve it in my main thread for both objects.
-
At the moment, in my main thread's slot that receives the data, I am only qDebugging the results. No modifications or other access, as I'm afraid of data being unsynchronised or something?
Is there be a problem when two signals emit the same slot at the same time in my main thread, as I have encountered a runtime error.
Thanks and if you need me to clarify or show the relevant parts of the code, anything I will most definitely do so. Your help is of utmost appreciation!
wrote on 12 Feb 2018, 09:00 last edited by@scottnat said in runtime error and QFuture:
Is there be a problem when two signals emit the same slot at the same time in my main thread
No, unless you force
Qt::DirectConnectionas I have encountered a runtime error
Post stack trace please
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wrote on 14 Feb 2018, 07:38 last edited byThis post is deleted!
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@scottnat said in runtime error and QFuture:
Is there be a problem when two signals emit the same slot at the same time in my main thread
No, unless you force
Qt::DirectConnectionas I have encountered a runtime error
Post stack trace please
wrote on 14 Feb 2018, 07:41 last edited by@VRonin
Hi, thanks VRonin for the reply. Turns out the problem was to do with the library of FFTW that I used.I used separate threads to run functions from that library, which apparently are not thread safe. However, even with mutex locks they still wouldn't work. Back to the drawing board.
Thanks.
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