Hi,
I am learning the URCU code.
Why do we need rcu_gp_lock in synchronize_rcu?
https://github.com/urcu/userspace-rcu/blob/master/urcu.c#L401
In the comment, it says this lock ensures mutual exclusion between
threads calling synchronize_rcu().
But only the first thread added to waiter queue can
On Wed, Apr 27, 2016 at 09:34:16PM -0400, Yuxin Ren wrote:
> Hi,
>
> I am learning the URCU code.
>
> Why do we need rcu_gp_lock in synchronize_rcu?
> https://github.com/urcu/userspace-rcu/blob/master/urcu.c#L401
>
> In the comment, it says this lock ensures mutual exclusion between
> threads ca
As they don't currently perform grace period, why do we use the rcu_gp_lock?
Thank you.
Yuxin
On Wed, Apr 27, 2016 at 10:08 PM, Paul E. McKenney
wrote:
> On Wed, Apr 27, 2016 at 09:34:16PM -0400, Yuxin Ren wrote:
>> Hi,
>>
>> I am learning the URCU code.
>>
>> Why do we need rcu_gp_lock in synch
Try building without it and see what happens when you run the tests.
Might well be that it is unnecessary, but I will defer to Mathieu
on that point.
Thanx, Paul
On Wed, Apr 27, 2016 at 10:18:04PM -0400, Yuxin Ren wrote:
> As they don't cur
Hi Paul and Yuxin,
On Wed, Apr 27, 2016 at 09:23:27PM -0700, Paul E. McKenney wrote:
> Try building without it and see what happens when you run the tests.
>
I've run a 'regtest' with the following modification out of curiousity:
diff --git a/urcu.c b/urcu.c
index a5568bdbd075..9dc3c9feae56 100
Hi Boqun and Paul,
Thank you so much for your help.
I found one reason to use that lock.
In the slow path, a thread will move all waiters to a local queue.
https://github.com/urcu/userspace-rcu/blob/master/urcu.c#L406
After this, following thread can also perform grace period, as the
global waite
On Thu, Apr 28, 2016 at 08:44:01PM +0800, Boqun Feng wrote:
> Hi Paul and Yuxin,
>
> On Wed, Apr 27, 2016 at 09:23:27PM -0700, Paul E. McKenney wrote:
> > Try building without it and see what happens when you run the tests.
> >
>
> I've run a 'regtest' with the following modification out of curi
On Thu, Apr 28, 2016 at 09:47:23AM -0400, Yuxin Ren wrote:
> Hi Boqun and Paul,
>
> Thank you so much for your help.
>
> I found one reason to use that lock.
> In the slow path, a thread will move all waiters to a local queue.
> https://github.com/urcu/userspace-rcu/blob/master/urcu.c#L406
> Afte
- On Apr 28, 2016, at 9:47 AM, Yuxin Ren r...@gwmail.gwu.edu wrote:
> Hi Boqun and Paul,
>
> Thank you so much for your help.
>
> I found one reason to use that lock.
> In the slow path, a thread will move all waiters to a local queue.
> https://github.com/urcu/userspace-rcu/blob/master/urcu
On Thu, Apr 28, 2016 at 02:38:40PM +, Mathieu Desnoyers wrote:
> - On Apr 28, 2016, at 9:47 AM, Yuxin Ren r...@gwmail.gwu.edu wrote:
>
> > Hi Boqun and Paul,
> >
> > Thank you so much for your help.
> >
> > I found one reason to use that lock.
> > In the slow path, a thread will move all
- On Apr 28, 2016, at 9:47 AM, Yuxin Ren r...@gwmail.gwu.edu wrote:
> Hi Boqun and Paul,
>
> Thank you so much for your help.
>
> I found one reason to use that lock.
> In the slow path, a thread will move all waiters to a local queue.
> https://github.com/urcu/userspace-rcu/blob/master/urcu
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