Visit the following useful resources:
- Visit the documentation page of the sync package, which can be found at https://golang.org/pkg/sync/.
- Visit the Rust web site at https://www.rust-lang.org/.
- Visit the Erlang web site at https://www.erlang.org/.
- Visit the documentation page of the sync package once more. Pay close attention to the sync.Mutex and sync.RWMutex types that will appear in the next chapter.