Re: Emacs design and architecture. How about copy-on-write?

[Emanuel Berg]

Eli Zaretskii wrote:

> We don't need to discuss all this because solutions for
> thread synchronization exist for a long time. We even use
> quite a few of them already: the Lisp threads we have in
> Emacs now provide some of these synchronization primitives,
> which are built on top of existing capabilities built into
> the OS and existing thread libraries.
>
> So the problem is not how to lock and serialize access to
> a variable in general, the problem is how to do this in
> Emacs so that we won't need to lock everything.

Okay, excellent, but then why isn't it enough to just maintain
a register of global variables and threads?

If a thread wants to use it, look in the register, is it
available? If not, get in line. And when it becomes available,
pop a thread in the line, if there is one, and start over?

Why do we have to lock everything just because we lock
a single variable?

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