From: Wanlong Gao <gaowanlong@cn.fujitsu.com>
To: Jan Stancek <jstancek@redhat.com>
Cc: ltp-list@lists.sourceforge.net, Jeffrey Burke <jburke@redhat.com>
Subject: Re: [LTP] [PATCH] mmstress: make shared global variables volatile
Date: Tue, 13 Mar 2012 20:09:32 +0800 [thread overview]
Message-ID: <4F5F38FC.7040001@cn.fujitsu.com> (raw)
In-Reply-To: <4F5F2238.9010402@redhat.com>
On 03/13/2012 06:32 PM, Jan Stancek wrote:
>
> Synchronization of threads depends on shared global variable.
> With gcc version 4.6.2 this test spins forever on:
> while (wait_thread)
> sched_yield();
>
> Make global shared variables volatile, so each thread
> sees current value.
>
> See also:
> Bug 36081 - gcc optimizations and threads (pthread)
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36081
>
> Signed-off-by: Jan Stancek <jstancek@redhat.com>
> ---
> testcases/kernel/mem/mtest05/mmstress.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
pushed, thanks Jan.
Wanlong Gao
>
>
>
>
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prev parent reply other threads:[~2012-03-13 12:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 10:32 [LTP] [PATCH] mmstress: make shared global variables volatile Jan Stancek
2012-03-13 12:09 ` Wanlong Gao [this message]
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