[UE4]如何跨线程访问GameThread中的数据

UE4中如果在自己创建的FRunnable线程中取访问引擎相关的API，比如你想在非GameThread中创建UI，运行时UE4时会给assert错误：

Assertion failed: IsInGameThread() [File:D:\BuildFarm\buildmachine_++UE4+Release-4.11\Engine\Source\Runtime\Slate\Public\Framework\Application\SlateApplication.h] [Line: 156] 

 

如何跨线程开访问UE4的API？

看了两个帖子，都说只能搞个queue，自定义线程往queue塞数据，Tick函数中对这个queue读取。因为GameThread中的数据不是线程安全的，所以只能通过这种方式。

 

自己创建的线程哪些不能做？官方文档上的回答：

https://wiki.unrealengine.com/Multi-Threading:_How_to_Create_Threads_in_UE4#What_Not_to_Do

• Do not try to modify, create, or delete UObjects from other threads!

You can prepare all the data / do all the calculations, but only the game thread should be actually spawning / modifying / deleting UObjects / AActors.

• Dont try to use TimerManager outside of the game thread :)

• Don't try to draw debug lines/points etc, as it will likely crash, ie DrawDebugLine(etc...)

 

参考：

How do I execute code on the Game thread from an FRunnable thread?

https://answers.unrealengine.com/questions/262585/how-do-i-execute-code-on-the-game-thread-from-an-f.html

Thread safety, delegates and bPostTickComponentUpdate

https://answers.unrealengine.com/questions/30413/thread-safety-delegates-and-bposttickcomponentupda.html