[ltt-dev] [PATCH RFC] call_rcu() interface for userspace-rcu

[Paolo Bonzini]

On 10/30/2010 10:57 AM, Paolo Bonzini wrote:
>
>         retry:
>          flags = crdp->flags;
>          if ((flags & URCU_CALL_RCU_REQUESTED))
>              continue;
>          if (cmpxchg (&crdp->flags, flags,
>                       flags & ~URCU_CALL_RCU_RUNNING) != flags)
>              goto retry;
>
>          futex_wait (&crdp->flags,
>                  flags & ~URCU_CALL_RCU_RUNNING);

(The above is missing setting URCU_CALL_RCU_RUNNING after the 
futex_wait; resetting URCU_CALL_RCU_REQUESTED can be done more or less 
anywhere, e.g. after synchronize_rcu).

Paolo