Unity Issue Tracker - [WebGL] Async Tasks do not run on WebGL when Threading is enabled

Fixed in 2020.2.X

Fixed in 2019.4.X, 2020.1.X

Votes

0

Found in

2019.3

2019.3.9f1

2020.1

2020.2

Issue ID

1243010

Regression

No

[WebGL] Async Tasks do not run on WebGL when Threading is enabled

WebGL

Apr 30, 2020

Reproduction steps:
1. Open the attached project ("case_1243010-WebG-Threads.zip")
2. Open the repro scene ("SampleScene")
3. Enter Play Mode
4. Notice the logs about async tasks being printed out to the screen
5. Exit Play Mode and make a WebGL build
6. Run the build and inspect the printed messages on the screen

Expected result: Async task messages are printed to the screen
Actual result: Only 'Start' and 'End' messages are printed to the screen (async tasks doesn't run)

Reproducible with: 2019.3.14f1, 2020.1.0b9, 2020.2.0a11
Couldn't test with 2018.4 (errors when building the project)

Tested with: Chrome (81.0.4044.138)

Resolution Note (fix version 2020.2):

IL2CPP wasn't generating the correct threaded code when threadingSupport flag was set in the project settings. Fixed in 2020.2.0a16
Resolution Note (fix version 2020.1):

Fixed in 2020.1.0b17.4177
Resolution Note (fix version 2019.4):

Fixed in - 2019.4.7f1

Comments (2)

Tom-Mensink

Feb 22, 2021 19:33

Why is this closed, doesn't work in 2019.4.8f1 either.
vvmichalk

Jan 13, 2021 12:31

Just tested in 2019.4.7f1, it does not work.
Simple thing like this does not work:

Test.text = "1";
await Task.Delay(1000);
Test.text += "2";
await Task.Delay(1000);
Test.text += "3";

Unity only pretends it's multi-platform, it's actually multi-pain.

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