Player hangs for 20 seconds after closing it when running threads

Unity: IL2CPP

IL2CPP

Open

2021.1.X

Fixed

2023.1.X

2022.2.X

2022.1.X

2021.3.X

2020.3.X

In 2020.3 the player didn't hang for 20 seconds, but has the same underlying issue. The issue is that IL2CPP leaks an internal thread object each time a thread is created. The shutdown code in 2021.2+ caused these leaked thread objects to slow the player close. So this fix only cleans up that memory leak (which is relatively small).

Reproduction steps:
1. Open the user's attached "SlowShutdown.zip" project
2. Go to Edit > Project Settings > Player > Other Settings > Configuration and make sure IL2CPP is set as Scripting Backend
3. Build and Run for PC, Mac & Linux Standalone
4. After the project is built and the Player opens, close it

Expected result: Player closes instantly
Actual result: Player hangs and closes after 20 seconds

Reproducible with: 2021.1.0a8, 2021.3.3f1, 2022.1.1f1, 2022.2.0a14
Not reproducible with: 2019.4.39f1, 2020.3.34f1, 2021.1.0a7

Not reproducible with: Mono Scripting Backend

Tested and reproduced with: Windows 10

Player hangs for 20 seconds after closing it when running threads

Unity: IL2CPP

Open

Fixed

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

Player hangs for 20 seconds after closing it when running threads

Unity: IL2CPP

Statuses

Open

Fixed

Resolution Notes

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?