Crate uplock

A futures-aware RwLock with ref_count, upgrade, and downgrade methods.

Based on the RwLock in futures_locks, which in turn is based on std::sync::RwLock.

Does not use message passing.

Structs

RwLock
RwLockReadFuture	A Future representing a pending read lock.
RwLockReadGuard	A read guard for RwLock (can be dereferenced into &T)
RwLockWriteFuture	A Future representing a pending write lock.
RwLockWriteGuard	A write guard for RwLock (can be dereferenced into &mut T)