One of the issues we saw earlier was that if we wanted to share something more complex than an integer or a Boolean between threads and if we wanted to mutate it, we needed to use a Mutex. This is not entirely true, since one crate, Crossbeam, allows us to use great data structures that do not require locking a Mutex. They are therefore much faster and more efficient.
Often, when we want to share information between threads, it's usually a list of tasks that we want to work on cooperatively. Other times, we want to create information in multiple threads and add it to a list of information. It's therefore not so usual for multiple threads to be working with exactly the same variables, since as we have seen, that ...
