Type Definition parking_lot::MappedReentrantMutexGuard

type MappedReentrantMutexGuard<'a, T> = MappedReentrantMutexGuard<'a, RawMutex, RawThreadId, T>;

An RAII mutex guard returned by ReentrantMutexGuard::map, which can point to a subfield of the protected data.

The main difference between MappedReentrantMutexGuard and ReentrantMutexGuard is that the former doesn’t support temporarily unlocking and re-locking, since that could introduce soundness issues if the locked object is modified by another thread.