Subj : Re: Challenge: Multithreading & Synchronization
To   : comp.programming.threads
From : Uenal Mutlu
Date : Wed May 18 2005 09:29 pm

"Sergei Organov" wrote
> "Uenal Mutlu"  writes:
> > "Sergei Organov" wrote
> > > "Uenal Mutlu"  writes:
> [...]
> > > I'm afraid it's so broken that it can't be fixed in parts.
> >
> > What exactly do you mean is broken?
>
> Almost everything.
>
> > > If you indeed need something working immediately, create single
> > > recursive lock and lock/unlock it at entry/exit to every function,
> > > deliver the application, and then start to re-design your
> > > application ASAP, where ASAP in fact means "as soon as you actually
> > > understand where and why it is flawed."
> >
> > Can you give an example for just the member function f2(), or more if
> > possible?
>
> Sorry, f2() with lock() at the beginning and unlock() at the end? Or
> f2() in a supposed to be a good design? In the former case it's trivial, in
> the latter case I'm afraid there will be no f2().

lock(), unlock() applied to what?
Why would you remove f2() since it is a member function, ie. an API function.
I wonder how else you would design the class.

> > > > What's unclear to you? The aim is to collect multiple solutions to the
> > > > problem.
> > >
> > > You see, for me your challenge sounds like this: "For undisclosed
> > > purpose I've created this messy broken skeleton and called it
> > > "real-world synchronization challenge". How do you fix my problem?".
> > > For me it's unclear what "solutions" you are going to collect then.
> > > IMHO, the best solution is to throw it away, sorry.
> >
> > I don't feel so. I would say it is a well-designed classic real-world example
> > for shared access to a class from multiple threads.
>
> Sorry, I give up. At least in C++ you don't have classes in the running
> program, so they can't be accessed even from single thread.

What? There is a global instance of Server called gServer...

> > How would you have designed or formulated it?
>
> Sorry, what "it"?

Of course the problem description.

.