This library provides a type, FusedRwLock, which has exclusive/shared semantics.
At any time, one thread may hold an exclusive lock over contents, or any number of threads may hold a shared lock to those contents. However, unlike a standard RwLock, after being locked shared at any point, it becomes impossible to acquire an exclusive lock again.
This may provide an advantage over using a standard RwLock, any time you have a value that's only written to once, and, after being read, is never written again (for example, a registry that's locked before it's accessed, or a resource loading scheme)
Copyright (C) 2021 Connor Horman.
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