From: Duncan Sands <baldrick@wanadoo.fr>
To: Heiko.Rabe@InVision.de
Cc: linux-kernel@vger.kernel.org
Subject: Re: inconsistent usage of
Date: Tue, 22 Apr 2003 10:40:45 +0200 [thread overview]
Message-ID: <200304221040.45480.baldrick@wanadoo.fr> (raw)
In-Reply-To: <OF07767E6D.29E660DD-ONC1256D10.002B8A2D@invision.de>
> void foo()
> {
> unsigned long local_flags;
> spin_lock_irqsave (&qtlock, local_flags);
> spin_lock_irqsave (&qtlock, local_flags);
> }
>
> Calling the function foo() works proper in none SMP kernels. I assume, the
> spinlocks internaly will be initialized as
> recursive semaphore as default. So it is possible to aquire it more than
> once by the same thread.
No. If you acquire it twice then you die. The above code is wrong.
Where did you find it?
All the best,
Duncan.
next prev parent reply other threads:[~2003-04-22 8:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-22 8:11 inconsistent usage of Heiko.Rabe
2003-04-22 8:40 ` Duncan Sands [this message]
2003-04-22 9:21 ` viro
2003-04-22 9:25 ` Jens Axboe
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