Are concurrent git operations on the same repo safe?

Hi all,

I'm generally used to the idea that if a thing is not marked as "thread-safe" then it isn't thread safe, but I thought I'd ask anyway to be sure.

Is it safe for me to do several operations with git concurrently on the same local repo? Specifically I'm trying to speed up "git submodule update" by doing several at the same time. I've noticed some odd side effects afterwards though when trying to commit changes to my super project.

Apologies if this is answered elsewhere, my google-foo is weak today.

Many thanks

Ian