dmBuffer::Create() crash (DEF-3761)

[selimanac]

Probably the same, Lua isn’t thread safe :

"Assertion failed" with Native Extension on iOS when invoke callbacks (Solved)

I couldn’t figure it out how to safely invoke lua callbacks from c++ thread. Little info; I’m developing a NE for our multiplayer game using uWebSockets and msgpack(it may change). Every socket connection has its own “thread” with lua callbacks like onConnect, onError, onMessage… I’m using two threats for now but it will be just one. Everything works fine on desktop(mac) even when I hard on it. I believe it is because the processor speed. But on ios(ipad 3 - ARMv7) I have bunch of “Assertion…

@Mathias_Westerdahl

There are various ways to deal with communicating between threads. One way we use is to post commands to a shared data structure, that you can then process in your UpdateExtension function.
Here’s such an example (https://github.com/defold/extension-admob/blob/master/admob/src/googlemobileads.cpp), although it should be noted that there too is an issue. In fact, we don’t protect that data queue with a lock of some kind (E.g. a mutex). To make sure that the data structure isn’t modified from two threads at once, you need to protect it.