Concread - Concurrently Readable Datastructures
Concurrently readable is often referred to as Copy-On-Write, Multi-Version-Concurrency-Control.
These structures allow multiple readers with transactions to proceed while single writers can operate. A reader is guaranteed the content will remain the same for the duration of the read, and readers do not block writers. Writers are serialised, just like a mutex.
You can use these in place of a RwLock, and will likely see improvements in parallel throughput.
The best use is in place of mutex/rwlock, where the reader exists for a non-trivial amount of time.
For example, if you have a RwLock where the lock is taken, data changed or read, and dropped immediately, this probably won't help you.
However, if you have a RwLock where you hold the read lock for any amount of time, writers will begin to stall - or inversely, the writer will cause readers to block and wait as the writer proceeds.
In the future, a concurrent BTree and HashTree will be added, that can be used inplace
RwLock<HashMap>. Stay tuned!
CowCell - A concurrently readable cell with Arc
EbrCell - A concurrently readable cell with Ebr