Is it possible to block the page being edited?

Question

Drupal

Several moderators work on the texts of the site. Often there is a situation that simultaneously over the same materials. What comes out of this - no need to explain. We need a module that prohibits entering the page editing mode if someone is already in this mode of this page. Has anyone come across? Is there something similar?
Drupal 7

Answer 1

https://www.drupal.org/project/content_lock

Answer 2

I don’t know ready-made modules, you need to look - I won’t be surprised if there are.
In general, describe the task and order the development. You can track it, but I think it's better if by clicking on editing the moderator sees not just "NO", but the opportunity to send a message to the person who edits.