31 Aug
2023
31 Aug
'23
9:35 p.m.
On Thu Aug 31 17:45:59 2023 +0000, Zebediah Figura wrote:
That's kind of surprising; win32 futexes are fair and we're using them internally. Why aren't our SRW locks fair?
So it's only unfair for a very specific test. It's a simple test where I just have threads constantly acquiring and releasing exclusive SRWLOCKs in s loop. What I observed is threads can loop back and immediately re-acquire the lock after releasing it, causing one thread at a time to dominate the lock.
This cannot happen with this MR. But if I make the change to allow it, this MR would get a lot faster.