Type Definition parking_lot::MappedMutexGuard

type MappedMutexGuard<'a, T> = MappedMutexGuard<'a, RawMutex, T>;

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

The main difference between MappedMutexGuard and MutexGuard 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.