Mara Bos 1016deb592 Small cleanups in Windows Mutex.
- Move `held` into the boxed part, since the SRW lock implementation
  does not use this. This makes the Mutex 50% smaller.
- Use `Cell` instead of `UnsafeCell` for `held`, such that `.replace()`
  can be used.
- Add some comments.
2020-09-12 20:50:17 +02:00
..
2020-09-12 20:50:17 +02:00
2020-09-08 17:23:26 -07:00