Re: brlock_is_locked()?

[Brad Chapman]

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--- Ben LaHaise <[e-mail]> wrote:
> On Wed, 22 Aug 2001, Brad Chapman wrote:
> 
> > restart:
> > 	if (brlock_is_locked(BR_NETPROTO_LOCK)) {
> > 		CRITICAL_SECTION
> > 		br_write_unlock_bh(BR_NETPROTO_LOCK);
> > 	}
> > 	else {
> > 		/* Let's get dizzy */
> > 		br_write_lock_bh(BR_NETPROTO_LOCK);
> > 		goto restart;
> > 	}
> 
> That code can never work.  None of the linux spinlocks track ownership, so
> checking if a lock is locked tells you if your process or another has
> ownership of the lock.  The above pseudo code is going to result in lots
> of mangled data.
> 
> 		-ben
> 
Mr. LaHaise,

	Eeek! Sorry. What do you expect at 10:00 at night? ;-)

	I'm not talking about _who_ owns the lock, I'm talking about whether
the lock itself is locked. I don't care which process is using the lock;
I just want to know if _somebody_ is using it. Is this possible?

Brad

=====
Brad Chapman

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