Andrew Stewart wrote:

> While a callback runs, does Vim block everything else?  Or do
> callbacks run at the same time as other things are executed?
> 
> In other words does Vimscript code with callbacks have to be thread-safe?

Callbacks are only run while waiting for the user to type a character.
This avoids one script interrupting another script at any point.
Vim itself is not multi-threaded.  You can get that with Python.
But it's tricky.

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