Ordering in ReaderWriterLock

Question

When I use lock(){...}, I cannot garantee which thread will enter the lock first.

What about ReaderWriterLock? Does it works like a FIFO for the writers or not?

Answer 1

What about ReaderWriterLock? Does it works like a FIFO for the writers or not?

It does.

And you pay a performance penalty for this, which is why ReaderWriterLockSlim was introduced—less overhead but it isn't "fair".