Re: My (lack of )wisdom about threads

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 24 May 2009 18:04:36 -0400

Message-ID:

<gvcg9m$rji$1@news.albasani.net>

Tom Anderson wrote:

On Sun, 24 May 2009, Lew wrote:

Roedy Green wrote:

IF you can arrange that threads don't modify the same variables, just
look at the same final variables, there is nothing to threads.

Arne Vajh?j wrote:

Not true.

There can still be both visibility and atomicity problems.

Mark Space wrote:

No, I think Roedy is correct. *Final* variables are treated
specially by the JVM, and are thread safe.

Not always. Final variables can point to mutable objects. Such
accesses must be synchronized to be thread safe.

Access to the final variables don't need to be - access to the non-final
variables in the referents do.

This is a clarification of what I said. Thank you.

... It's worth clarifying that
his advice means not using any non-final variables even in referred-to
objects, but if that's what you were saying, then it would be worth
clarifying that you were making a clarification!

As you just did.

--
Lew