From: Jens Gustedt <jens.gustedt@inria.fr>
To: musl@lists.openwall.com
Subject: Re: C11 threads
Date: Sat, 26 Jul 2014 17:48:54 +0200 [thread overview]
Message-ID: <1406389734.17153.124.camel@eris.loria.fr> (raw)
In-Reply-To: <1406359000.6438.95.camel@eris.loria.fr>
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Am Samstag, den 26.07.2014, 09:16 +0200 schrieb Jens Gustedt:
> And you are right mentioning that, in many situations spin locks do
> effectively suffice. C11 has atomic_flag for that. Often locks are
> just taken for critical sections of code that do a small task, just
> some instructions.
Curiously, I just tracked down a use of pthread_mutex_lock and
pthread_mutex_unlock that I couldn't explain. It came from libatomic
as of gcc-4.9.0.
Looking into that, I see that they got the locking part for the non
lock-free atomics in their POSIX version plain wrong. Not only that
this sucks in the symbols which they shouldn't, but pthread_mutex_t is
just not the right tool for the task. It should be atomic_flag.
Jens
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prev parent reply other threads:[~2014-07-26 15:48 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 10:00 Jens Gustedt
2014-07-25 10:40 ` Szabolcs Nagy
2014-07-25 11:06 ` Jens Gustedt
2014-07-25 13:04 ` Szabolcs Nagy
2014-07-25 13:38 ` Jens Gustedt
2014-07-25 13:42 ` Morten Welinder
2014-07-25 14:15 ` Szabolcs Nagy
2014-07-25 16:14 ` Rich Felker
2014-07-25 21:59 ` Jens Gustedt
2014-07-25 22:25 ` Rich Felker
2014-07-25 15:41 ` Rich Felker
2014-07-25 17:10 ` Jens Gustedt
2014-07-25 22:19 ` Rich Felker
2014-07-25 23:26 ` Jens Gustedt
2014-07-26 2:24 ` Rich Felker
2014-07-26 7:16 ` Jens Gustedt
2014-07-26 7:35 ` Rich Felker
2014-07-26 8:32 ` Jens Gustedt
2014-07-26 9:03 ` Rich Felker
2014-07-26 11:15 ` Jens Gustedt
2014-07-26 15:48 ` Jens Gustedt [this message]
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