From: "Paul D. DeRocco" <pderocco@ix.netcom.com>
To: "eCos Discuss" <ecos-discuss@ecos.sourceware.org>
Subject: RE: [ECOS] I2C driver DSR locking
Date: Wed, 04 Apr 2007 16:59:00 -0000 [thread overview]
Message-ID: <001501c776da$95f5cad0$8d7ba8c0@PAULD> (raw)
In-Reply-To: <m3fy7gb4jv.fsf@xl5.calivar.com>
> From: Nick Garnett
>
> It is a general feature of all thread suspension. Each
> thread's scheduler lock level is essentially part of its
> state and is saved and restored across all thread switches.
> Historically this was not always the case, and cond_wait had
> special code to support this kind of use. But it was
> considered so useful that I made it a generic feature several
> years ago.
So the implication of this is that when a thread holds the DSR lock, it
can't be pre-empted, but it can still yield or sleep of its own volition. Is
that correct?
--
Ciao, Paul D. DeRocco
Paul mailto:pderocco@ix.netcom.com
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
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next prev parent reply other threads:[~2007-04-04 16:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-03 19:08 Rob Duncan
2007-04-03 21:28 ` Paul D. DeRocco
2007-04-03 21:39 ` Rob Duncan
2007-04-04 4:41 ` Daniel Helgason
2007-04-04 14:25 ` Nick Garnett
2007-04-04 16:59 ` Paul D. DeRocco [this message]
2007-04-10 10:31 ` Nick Garnett
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