From: Alexander Monakov <amonakov@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: [PATCH] a new lock algorithm with lock value and CS counts in the same atomic int
Date: Sun, 18 Jun 2017 17:58:05 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.20.13.1706181756230.21867@monopod.intra.ispras.ru> (raw)
In-Reply-To: <20170618144518.GT1627@brightrain.aerifal.cx>
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
next prev parent reply other threads:[~2017-06-18 14:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 7:11 Jens Gustedt
2017-06-18 10:01 ` Alexander Monakov
2017-06-18 11:10 ` Jens Gustedt
2017-06-18 11:49 ` Alexander Monakov
2017-06-18 14:45 ` Rich Felker
2017-06-18 14:58 ` Alexander Monakov [this message]
2017-06-18 13:40 ` Alexander Monakov
2017-06-18 14:53 ` Rich Felker
2017-06-18 15:05 ` Alexander Monakov
2017-06-18 16:04 ` Rich Felker
2017-06-18 17:31 ` Jens Gustedt
2017-06-18 19:32 ` Jens Gustedt
2017-06-18 20:20 ` Rich Felker
2017-06-18 20:38 ` Alexander Monakov
2017-06-18 17:40 ` Jens Gustedt
2017-06-18 15:01 ` Rich Felker
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