Repos have a state called locked that can be true or false. The hg/git commands hg/git clone, hg/git pull, and hg/git push influence this state:
RhodeCode will remember the user id who locked the repo only this specific user can unlock the repo (locked=false) by calling
every other command on that repo from this user and every command from any other user will result in http return code 423 (locked)
additionally the http error includes the <user> that locked the repo (e.g. “repository <repo> locked by user <user>”)
So the scenario of use for repos with locking function enabled is that every initial clone and every pull gives users (with write permission) the exclusive right to do a push.
Each repo can be manually unlocked by admin from the repo settings menu.