UE5-FRunnable-ThreadTest

This is a simple little project with functional FRunnable threads.

To try it out:

• Compile in your favorite IDE
• Launch UEditor
• Start PIE

Once in PIE, you'll see this widget at the top left of the viewport:

You can change the number of threads to whatever you want and click the Start button to spawn the threads.

The threads "work" by sleeping for a random 0.5 - 2.5 seconds. After working, there is a 90% chance for the thread to pretend there is more work to do. Thus, all threads will eventually randomly decide they are done working.

At any time you can click the Stop button to instruct the threads to exit ASAP.

This widget is super simple and doesn't do anything interesting. It only interfaces with the AXistPlayerController C++ class, which is what does the interesting stuff.

Interesting C++

FRunnableNonsense

Source: [ cpp | h ]

This is the actual FRunnable thread class, the central idea explored in this project.

AXistPlayerController

Source: [ cpp | h ]

The Player Controller is what actually manages the threads in this project. You can ignore most of it, except for these interesting methods:

AXistPlayerController::StartNonsense(Num)

• Called by the widget to start Num FRunnableNonsense threads
  • Invoked by the Start button

AXistPlayerController:StopNonsense()

• Called by the widget to stop all running FRunnableNonsense threads
  • Invoked by the Stop button

AXistPlayerController::Tick()

• Detects FRunnableNonsense threads that have exited and cleans up the memory associated with them

AXistPlayerController::EndPlay()

• Cleans up any remaining FRunnableNonsense threads that are still running

Widget BP

The widget BP is super simple, all it does is call the above methods in the AXistPlayerController.