From: jamie@shareable.org (Jamie Lokier)
To: linux-arm-kernel@lists.infradead.org
Subject: [arm-gnu] Problems with pthread on ARM/PXA270
Date: Fri, 18 Sep 2009 13:48:48 +0100 [thread overview]
Message-ID: <20090918124848.GA1631@shareable.org> (raw)
In-Reply-To: <20090918075355.GA13044@pengutronix.de>
Uwe Kleine-K?nig wrote:
> On Thu, Sep 17, 2009 at 08:54:44AM +1000, James wrote:
> > Are you running with superuser privileges? My manpage tells me that
> > SCHED_RR is only available if run with superuser privileges.
> Note that pthread_attr_setschedpolicy has a return value that tells you
> if the function was successful.
And that SCHED_RR has a time quantum returned by sched_rr_get_interval
which is not guaranteed to be small. However, if it is a small time
and it's not switching that's a bug in either libc or the kernel.
Note that printf() does locking which may complicate things. Try
opening separate outputs for each thread, or using write().
-- Jamie
next prev parent reply other threads:[~2009-09-18 12:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-16 7:26 Problems with pthread on ARM/PXA270 Juergen Schindele
2009-09-16 14:14 ` Eric Miao
2009-09-16 15:01 ` Juergen Schindele
2009-09-16 15:06 ` Eric Miao
2009-09-17 7:35 ` Juergen Schindele
2009-09-17 12:47 ` Beckwith, Stephen (Stephen)
2009-09-17 13:06 ` Juergen Schindele
2009-09-21 21:19 ` Beckwith, Stephen (Stephen)
2009-09-16 14:40 ` Daniel Jacobowitz
2009-09-18 10:06 ` Juergen Schindele
2009-09-18 14:10 ` Daniel Jacobowitz
2009-09-16 22:01 ` Jamie Lokier
2009-09-16 22:54 ` [arm-gnu] " James
2009-09-18 7:53 ` Uwe Kleine-König
2009-09-18 12:48 ` Jamie Lokier [this message]
2009-09-24 8:34 ` Juergen Schindele
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