From: Alexander Monakov <amonakov@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: semaphore redesign
Date: Sun, 1 Mar 2015 21:54:13 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.11.1503012129270.19651@monopod.intra.ispras.ru> (raw)
In-Reply-To: <20150228154247.GQ23507@brightrain.aerifal.cx>
A few more things from IRC discussion.
Fields in the semaphore struct should be made volatile.
The new implementation eliminates the last call site with non-dummy cleanup
argument to __timedwait.
New sem_timedwait shows worse performance in Rich's sem-bench on my desktop, I
think primarily because it does not have sem_trywait preceding the spin loop
anymore, plus the loop itself is also a bit leaner. My proposal is to use a
different spin count somewhere in 150-200 range instead of 100.
Alexander
next prev parent reply other threads:[~2015-03-01 18:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-27 2:33 sem_getvalue conformance considerations Rich Felker
2014-08-27 7:05 ` Jens Gustedt
2014-08-27 7:43 ` Rich Felker
2014-08-27 10:43 ` Alexander Monakov
2014-08-27 13:32 ` Alexander Monakov
2014-08-27 19:06 ` Alexander Monakov
2014-08-27 21:06 ` Alexander Monakov
2014-08-28 20:47 ` Alexander Monakov
2014-08-29 22:51 ` Alexander Monakov
2014-08-30 5:12 ` Rich Felker
2014-09-01 17:50 ` Alexander Monakov
2015-02-27 23:21 ` semaphore redesign Alexander Monakov
2015-02-28 15:42 ` Rich Felker
2015-03-01 18:54 ` Alexander Monakov [this message]
2015-03-01 17:30 ` Szabolcs Nagy
2015-03-01 17:50 ` Szabolcs Nagy
2015-03-02 22:40 ` Alexander Monakov
2015-03-02 22:45 ` Rich Felker
2015-03-01 18:24 ` Alexander Monakov
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