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Is the Unity API threadsafe?

I notice that Unity supports background loading of asset bundles, so I guess uses threads. Can I use threads in my own script and plugins? Are there any issues to be aware of?

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asked Oct 07 '09 at 04:53 PM

Graham Dunnett gravatar image

Graham Dunnett ♦♦
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2 answers: sort voted first

No.

Every call you make into the Unity API, must be done from your main thread. It is possible for you to create your own threads, to make whatever calculations you like, however, the additional threads you create yourself should not call any Unity functions. They should communicate their results back to the mainthread, which can then call the Unity functions.

If you try to do this anyway, it might accidentally work, however future Unity updates (including those of the webplayer) are very likely to make this break.

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answered Oct 18 '09 at 01:42 PM

Lucas Meijer 1 gravatar image

Lucas Meijer 1 ♦♦
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To help you avoiding using the Unity APIs in a non-threadsafe manner, Unity 2.6 will now throw an exception in the editor if your code invokes API functions from a thread that's not the main thread.

For performance reasons this check is disabled in published builds however.

Nov 10 '09 at 12:23 PM Keli Hlodversson ♦♦

Hey Keli, thanks for that information (and also thanks to whoever implemented that) - sounds like a great idea to me to make Unity more robust!

Dec 10 '09 at 06:06 PM jashan

the assert you get is:

m_ThreadCheck && !Thread::EqualsCurrentThreadID(m_ThreadID)

Jan 12 '10 at 08:50 PM Graham Dunnett ♦♦

I have been running into this issue, without explicitly starting a new thread. The one thing I suspect is the root of this evil is my usage of a static class, my lazy way of keeping track of my "globals". When trying to asyncloadlevel from my static class i get the dreaded m_ThreadCheck message

Mar 29 '10 at 07:04 AM user-1883 (google)

Dislike. ;)

Feb 24 '11 at 03:59 AM yoyo
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You can achieve some of the advantages of threads by using coroutines - see the Coroutines and Yield overview in the Scripting Reference.

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answered Nov 07 '09 at 09:48 PM

technicat gravatar image

technicat
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this question is asked and answered by unity technologies staff to teach us something. someone that wants to use threads already knows coroutines. :D threads are some of the most advanced stuff in programming. however using them in C# is alot easier than C++. unity's scripting engine is the best choice that they made! thank you guys

Dec 31 '09 at 03:21 PM Ashkan_gc
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asked: Oct 07 '09 at 04:53 PM

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Last Updated: Jan 04 '13 at 01:04 PM