From: "Devon H. O'Dell" <devon.odell@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] Re: [sources] 20070413: /rc/bin/cpurc.local
Date: Sun, 15 Apr 2007 13:43:14 -0400 [thread overview]
Message-ID: <9ab217670704151043j1da7acc2j61869c6d54f736f7@mail.gmail.com> (raw)
In-Reply-To: <9ab217670704151026k6de961c0q1ecd0385c95772c7@mail.gmail.com>
2007/4/15, Devon H. O'Dell <devon.odell@gmail.com>:
> p->mach is a pointer back to a machine structure. I'm assuming this
> only gets set when a process is being run. I suppose this test is here
> in case another CPU took over running the process.
Though, this can't be the case, because m->readied isn't locked when
we come in here, and if we're running MP, wouldn't it be possible
(though unlikely) that another CPU takes the process between the
assignment and the test? Especially if running heavily threaded
applications on MP systems?
> --dho
next prev parent reply other threads:[~2007-04-15 17:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <f93786a38200d44b7406b3181b4e2c20@cat-v.org>
2007-04-15 8:06 ` Uriel
2007-04-15 17:00 ` Uriel
2007-04-15 17:26 ` Devon H. O'Dell
2007-04-15 17:35 ` erik quanstrom
2007-04-15 17:37 ` Devon H. O'Dell
2007-04-15 17:38 ` Russ Cox
2007-04-15 17:43 ` Uriel
2007-04-15 20:31 ` Devon H. O'Dell
2007-04-15 17:43 ` Devon H. O'Dell [this message]
2007-04-15 17:59 ` Russ Cox
2007-04-15 20:34 ` Devon H. O'Dell
2007-04-17 5:21 ` Russ Cox
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