[Click] Handler Synchronization question

[Roman Chertov]

> Are you talking about a case in which you need to set Handler::NONEXCLUSIVE
> for performance reasons?

Yes, I have an element that emulates an MF-TDMA link, and the MF-TDMA schedule
can be altered at arbitrary points in time by a user level process.  So ideally,
I would like to be able to install a new schedule, while continuing to emulate
the link.  

Roman

> 
> BBL
> 
> --- On Fri, 2/11/11, Roman Chertov <rchertov at cs.ucsb.edu> wrote:
> 
> > From: Roman Chertov <rchertov at cs.ucsb.edu>
> > Subject: [Click] Handler Synchronization question
> > To: click at pdos.csail.mit.edu
> > Date: Friday, February 11, 2011, 10:27 AM
> > I have a question regarding
> > synchronization between the handlers and the main
> > element code.  As far as I understand, using
> > Handler::NONEXCLUSIVE flag when
> > defining a handler allows for the case where the main
> > thread executes a task for
> > some element, while at the same time the handler for that
> > element can get
> > called.
> >
> > However, the following comment for SpinLock got me confused
> > as to how ensure
> > atomic operations when the element task and the handler
> > execute at the same
> > time.
> >
> >  * Spinlock operations do nothing unless Click was compiled
> > with SMP support
> >  * (with --enable-multithread).  Therefore, Spinlock
> > should not be used to,
> >  * for example, synchronize handlers with main element
> > threads.  See also
> >  * SpinlockIRQ.
> >
> > If Spinlock is not the proper mechanism, what is the proper
> > way to do it when
> > building an element that must work in user and kernel
> > levels?
> >
> > Thanks,
> >
> > Roman
> >
> >
> > _______________________________________________
> > click mailing list
> > click at amsterdam.lcs.mit.edu
> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> >
> 
> 
> 
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