linux-kernel - Re: linux missing support for _POSIX_THREAD

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Message-ID: <4A1D7512.9080604@nortel.com>
Date:	Wed, 27 May 2009 11:14:58 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: linux missing support for _POSIX_THREAD_CPUTIME?

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
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