From: "Chris Friesen" <cfriesen@nortel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Ulrich Drepper <drepper@redhat.com>,
Roland McGrath <roland@redhat.com>
Subject: Re: linux missing support for _POSIX_THREAD_CPUTIME?
Date: Wed, 27 May 2009 11:14:58 -0600 [thread overview]
Message-ID: <4A1D7512.9080604@nortel.com> (raw)
In-Reply-To: <alpine.LFD.2.00.0905271855290.3397@localhost.localdomain>
Thomas Gleixner wrote:
> On Wed, 27 May 2009, Chris Friesen wrote:
>
> That's more a question for the glibc folks. CC'ed.
Actually, I'm looking at the kernel code here. It looks like
posix_cpu_clock_get() should be able to handle a per-task cpu clock for
another thread within the same process. However, it's only ever called
by thread_cpu_clock_get(), which hardcodes a clock_id of THREAD_CLOCK,
which corresponds to the current thread.
Similarly, invalid_clockid() will say that the clock_id is invalid if
it's positive but greater than 15. If my math is right, this means that
any pid > 2 will result in invalid_clockid() failing.
Chris
next prev parent reply other threads:[~2009-05-27 17:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-27 16:46 linux missing support for _POSIX_THREAD_CPUTIME? Chris Friesen
2009-05-27 16:56 ` Thomas Gleixner
2009-05-27 17:14 ` Chris Friesen [this message]
2009-05-27 17:36 ` Thomas Gleixner
2009-05-27 20:00 ` Chris Friesen
2009-05-27 17:49 ` Roland McGrath
2009-05-27 17:00 ` linux missing support for _POSIX_THREAD_CPUTIME ? Chris Friesen
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