Re: [boost] Re: Boost.Thread

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-09-16 13:15:44

At Monday 2002/09/16 10:14, you wrote:

>"Victor A. Wagner, Jr." wrote:
> >
> > At Monday 2002/09/16 05:29, you wrote:
> >
> > >"Hillel Y. Sims" wrote:
> > > >
> > > > "Eric Woodruff" <Eric.Woodruff_at_[hidden]> wrote in message
> > > > news:014f01c25a8f$605ebd80$1800000a_at_soy...
> > > > > When return values enter the picture, join needs to become the return
> > > > value
> > > > > accessor, allowed to be called more than once
> > > >
> > > > If this is the case, how would the thread library know when to finally
> > > clean
> > > > up the finished thread's resources?
> > >
> > >When the last reference goes away (i.e. managing thread objects via
> > >smart pointers; I'd even choose *AUTO*_ptr like move semantics by
> > >default with some "shared ownership" adapter for {current} standard
> > >containers and algorithms). http://www.terekhov.de/mythread.c
> > >
> > >---
> > >int my_thread_join( my_thread_t mt,void** value_ptr );
> > >
> > >int my_thread_tryjoin( my_thread_t mt,void** value_ptr );
> > >
> > >int my_thread_timedjoin( my_thread_t mt,
> > >                          struct timespec* timeout,
> > >                          void** value_ptr );
> > >---
> >
> > So, we're going to intentionally put a "timing window" problem into user
> > code.... multiple join() will work just fine _provided_ that all the
> > relevant join() requests actually occur _before_ the thread terminates.
> > Otherwise, all bets are off.
>
>What makes you think so?

well, unless you have some way of generating the references at compile 
time, the only way to detect that the reference exists is to wait for the 
join() call.  So whether it will ever even be "seen" will depend on whether 
the thread still exists (i.e., not all the other references have "gone away").

> > I don't like it.
>
>``Me too.'' ;-)
>
>regards,
>alexander.
>
>
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Victor A. Wagner Jr.      http://rudbek.com
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