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Date: Sun, 18 Jun 2017 17:58:05 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] a new lock algorithm with lock value and CS counts
in the same atomic int
On Sun, 18 Jun 2017, Rich Felker wrote:
> > I think the fastpath in __unlock can check the value of the lock against 0,
> > exiting immediately if equal.
>
> Do you mean that would indicate that __lock was a nop because
> libc.threads_minus_1 was 0 at lock time?
Yes, if we didn't elide in __lock, we must observe a negative value in __unlock.
Alexander
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