Re: [PATCH] Documentation: Remove misleading examples of the barriers in wake_*()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Sep 24, 2015 at 09:21:22PM +0800, Boqun Feng wrote:
> > Included in it are some of the details on this subject, because a wakeup
> > has two prior states that are of importance, the tasks own prior state
> > and the wakeup state, both should be considered in the 'program order'
> > flow.
> > 
> 
> Great and very helpful ;-)
> 
> > So maybe we can reduce the description in memory-barriers to this
> > 'split' program order guarantee, where a woken task must observe both
> > its own prior state and its wakee state.
>                               ^^^^^
> I think you mean "waker" here, right?

Yes.

> And the waker is not necessarily the same task who set the @cond to
> true, right? 

It should be.

> If so, I feel like it's really hard to *use* this 'split'
> program order guarantee in other places than sleep/wakeup itself. Could
> you give an example? Thank you.

It was not meant to be used in any other scenario; the 'split' PO really
is part of the whole sleep/wakeup. It does not apply to anything else.
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux