Out of curiosity, why is `read` extension method a...

# random

[Albert]

Out of curiosity, why is read extension method added on ReentrantReadWriteLock and not the interface ReadWriteLock?

[hudsonb]

I'd guess it is because what exactly needs to be performed may vary between implementation of that interface. For example for ReentrantReadWriteLock.write attempts to "upgrade" from a read lock to a write lock if neccessary by releasing all read locks, obtaining a write lock, performing the task, then acquiring the read locks again.