Similar to Rust's `std::sync::Mutex` in that it requires one to unwrap
the object before accessing it, acquiring the mutex in the process.

PR-URL: https://github.com/nodejs/node/pull/31717
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: David Carlier <devnexen@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/26634
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>

We generally add these to all headers that are considered
internal to Node.

These aren’t distributed as part of the headers tarball,
so I think this does not have to be semver-major
(and we have been changing the APIs in these headers
freely anyway).

PR-URL: https://github.com/nodejs/node/pull/22514
Reviewed-By: James M Snell <jasnell@gmail.com>

We will be introducing many more critical sections in the upcoming
multi-isolate changes, so let's make manual synchronization a thing
of the past.

PR-URL: https://github.com/nodejs/node/pull/7334
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>