Signals And Slots Across Threads Qt
Qt already provides signals and slots for its classes, which you can use in your application. For example, QPushButton has signal clicked, which will be triggered when the user clicks on the button. Another example: the QApplication class has a slot quit function, which can be called when you want to terminate your application. Support for Signals and Slots. Connections may be made across threads. Signals may be disconnected. However, where a class has overloaded Qt signals (ie. With the same name but with different arguments) PyQt5 needs additional information in order to automatically connect the correct signal.
I once debated over the circumstances during whichthreading would be preferable over forking. By the end of my researchand discussions with others, we had come to the conclusion thatthreads are ideal when you want access to some data between yourprocessing branches. But you have to be careful to avoid the pitfallsof non-thread-safe behavior.
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Remember to keep everything as small and simple aspossible. Nobody wants to maintain your clever multithreading tricks,or your gigantic god-structures; least of all your future self. Qtprovides an easy to use write locker method that automatically unlocksat the end of its method. If you are concerned about the performancehit, you need to get away from your computer and revisit the design.Keep your locks small and fast.
Wrong:
Lock -> long process -> mutate data -> unlock Hollywood casino toledo ohio winners.
Qt Debug Signal And Slot
Right:
Long process -> lock -> mutate data -> unlock
If you are looking at mutating a large data structure,which might take a long time to iterate and process, try to breakdown the problem: Copy out the necessary components to change and addthem back in. Since this isn't Haskell, copying the entire structurecan lock up your treads on its own. You need to break your problemdown into more manageable components. That means breaking down thedata structures into reasonable, logical modules as well as themethods.
LockerDeclaration
You will need some accessible memory set aside in yourworker class to use. Fist you will need to declare some memory thatthe lock will use. Then you will need a pointer to the location inmemory where you want to change the data. This data was initializedin the main thread, and the worker takes its address whenconstructed.
https://gist.github.com/erickveil/9d3688cccf099b51830eThe useLockToChange method will perform that quick lockand mutation we want.
LockingMethod
Again, this is where we want to keep it a simple andsmall as possible. Qt's write locker will automatically unlock whenthe calling method returns. I think that if you need to specificallylock and unlock a section of a larger method, then you need torefactor: You are trying to do too much with a single method.
Qt Signal Slot Example
https://gist.github.com/erickveil/9ea942047aa8740f7042Signalsand Slots (The Unfortunate Wrong Way)
Qt Signal Slot With 2 Arguments
It's worth noting that at first Ithought signals and slots would be an excellent means of transferringdata across threads. However, you will find that the timing ofemitting a signal might not be what you expect, at least in a typicalcommand line application.
https://gist.github.com/erickveil/7f5c28f35fe7cc2ef91aAdd the member variable to be changedon the MainClass in your main thread. Also define your slot here. Weare going to emit a matching signal, with a string passed as anargument from the worker thread back to here. We make the actualchange of the value from the slot on the main thread, so you wouldthink it would be safe to assume that there is no need to lock tomake the change.
Signal And Slot In Qt
Running the application now will revealthat no matter where you emit the signal, the slot does not run untilthe emitting thread finishes. You will see the initial value for thisnew variable printed the same as it started, at the same time thealtered locked variable is printed. Only when the thread declares itis finished do we see the output from the slot method, announcing thedata change.