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Fixed in 2018.2.X



Found in


Issue ID




BackgroundWorker's completion callback doesn't get called at the end of the task



To reproduce:
1) Create new project
2) Create and open new C# script
3) Add this function to it (and necessary using's):

[UnityEditor.MenuItem("Window/Test BackgroundWorker")]
private static void TestBackgroundWorker()
var w = new BackgroundWorker();
w.RunWorkerCompleted += (o, e) => UnityEngine.Debug.Log("Completed");
w.DoWork += (o, e) => { UnityEngine.Debug.Log("Background task start"); Thread.Sleep(1000); UnityEngine.Debug.Log("Background task end"); };

4) Save the script
5) In top menu bar, select the new menu option you created (Window/Test BackgroundWorker)

Expected: You should get three messages - task start, end and completion
Actual: Completion message doesn't fire

Does not happen in play mode - all three messages fire there

Reproduced in 2017.1.0f3, 2017.2.1p2, 2018.1.0b3

Comments (1)

  1. msue2

    Dec 19, 2019 10:21

    In the Editor, the background worker's completion callback is not called still, in case the Editor enters play mode during background execution. The thread appears to be silently terminated (2019.2.1f1).

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