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cb4efdbc19
* `write` was returning `true` even though it shouldn't because it
should return `false` in case it was already acquired.
* `read` theoritically can increase `nread` after another thread calls
`unlock` between first lock load and increase of `nread`. So it looks
something like this:
1. THREAD 1: read()
2. THREAD 2: get lock = `SHARED_LOCK`
3. THREAD 1: unlock -> lock is now `NO_LOCK`
4. THREAD 2: increase nread, return true.
This is obviously wrong because `nreads` will be ` > 0 ` but `lock`
is `NO_LOCK`
Closes #1676