[boost] Re: Lock unification (shared vs. upgradable)

From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2004-08-09 12:03:51

Rob Stewart wrote:
> 
> From: Alexander Terekhov <terekhov_at_[hidden]>
> > Rob Stewart wrote:
> > [...]
> > > Call me ignorant, but what does "Oder" mean?  www.m-w.com has an
> >
> > Try http://dict.leo.org ;-)
> 
> No help.  Apparently, "oder" is German for "or."  Your original
> message was:
> 
> > Howard Hinnant wrote: ...
> >
> > void read_write(rw_mutex& m, which_t w) {
> >   sharable_lock<rw_mutex, true> read_lock(m);
> >   // May need access to many releated which_t's
> >   if (compute_expensive_result(w)) {
> >     // Upgrade (blocks upcoming readers while pending)
> >     scoped_lock<rw_mutex> write_lock(upgrade(read_lock));
> >     if (read_lock.atomic_upgrade()) {
> >       modify_state(w);
> >       if (write_lock.upgrade_pending())
> >         register_change(w);
> >     }
> >     else if (!computation_invalidated(w) || // check registry
> >              compute_expensive_result(w)) {
> >       modify_state(w);
> >       write_lock.upgrade_pending() ?
> >         register_change(w) : clear_registry();
> >     }
> >     else if (!write_lock.upgrade_pending()) {
> >       clear_registry();
> >     }
> >   }
> > }
> >
> > Oder (verbosity aside for a moment)?
> 
> So, you quoted what Howard wrote and ...

Uhmm. Howard wrote "sharable_lock<rw_mutex, true> read_lock(m)"
(a few other bits aside for a moment). Howard didn't write the 
rest. The poem is mine! Oder? ;-)

regards,
alexander.