[MrBra]

Excuse me for the following dumb question.

In past I've used Java/SWT and C#/WinForms. Both of those come with a concept of the UI thread, which is the thread which you should use to read from and write to the UI.

What I don't understand about these multiplatform libraries is: do they also provide this mechanism, or are they actually only responsible for drawing the widgets and forms, leaving to the developer (and the guest language they are using to leverage the library) to implement that part through threads or some different pattern (i.e. reactor pattern)?