Module len_caching_lock::mutex

Structs

CachingMutexGuard	Guard comprising MutexGuard and AtomicUsize for cache
LenCachingMutex	Can be used in place of a Mutex where reading T’s len() without needing to lock, is advantageous. When the Guard is released, T’s len() will be cached. The cached len() may be at most 1 lock behind current state.