Groups > comp.lang.java.programmer > #14862

Re: Proposed new Java feature

From	markspace <-@.>
Newsgroups	comp.lang.java.programmer
Subject	Re: Proposed new Java feature
Date	2012-05-28 08:28 -0700
Organization	A noiseless patient Spider
Message-ID	<jq05ij$kt9$1@dont-email.me> (permalink)
References	(5 earlier) <jptvdf$1s5$1@dont-email.me> <jpu11t$c79$1@dont-email.me> <jpu7m3$k7e$1@dont-email.me> <jpu9aj$t3p$1@dont-email.me> <a2h1djFoq2U2@mid.individual.net>

Show all headers | View raw

On 5/28/2012 3:13 AM, Robert Klemme wrote:
> How can you know if you did not create the thread?

But we are creating the thread.  It's part of a thread pool for general 
use.  That's his use case; it's the fundamental crux of his request.

> If the thread dies as
> in "terminates and then is GC'ed" there is no need for additional
> cleanup because GC will do that just fine.

Threads in a thread pool don't die, they are re-used.  Hence the need 
for manual (even external) clean-up.

> But he cannot know how long ThreadLocals need to stay which are not
> created in his code.

When the thread is returned to the pool, all thread locals must be 
marked as invalid.  Period.

> If there is a real problem then it's not using ThreadLocal properly.
> That should be fixed. And not a dangerous functionality added to
> standard library where changes are enormous to wreck havoc on all sorts
> of code.

I can think of a few scenarios where it would be useful to use both 
thread locals and a thread pool, so while maybe "dangerous" it's still 
something we should investigate properly.  Hacks like the reflective 
code I linked to earlier that dump private fields seem a lot more 
"dangerous" to me, yet they are currently needed.

Thread

Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-26 16:11 -0700
  Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-27 13:32 +0200
    Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-27 11:14 -0700
      Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-28 12:13 +0200
      Re: Proposed new Java feature v_borchert@despammed.com (Volker Borchert) - 2012-06-04 20:16 +0000
  Re: Proposed new Java feature markspace <-@.> - 2012-05-27 09:28 -0700
    Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-27 11:00 -0700
      Re: Proposed new Java feature Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-27 11:46 -0700
        Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-27 12:04 -0700
          Re: Proposed new Java feature Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-27 15:30 -0400
            Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-27 12:59 -0700
              Re: Proposed new Java feature Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-27 17:51 -0400
                Re: Proposed new Java feature markspace <-@.> - 2012-05-27 15:20 -0700
                Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-28 12:13 +0200
                Re: Proposed new Java feature markspace <-@.> - 2012-05-28 08:28 -0700
                Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-28 19:29 +0200
                Re: Proposed new Java feature markspace <-@.> - 2012-05-28 12:16 -0700
                Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-28 22:58 +0200
                Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-28 21:40 -0700
                Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-29 22:52 +0200
                Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-29 18:53 -0700
                Re: Proposed new Java feature Tom Anderson <twic@urchin.earth.li> - 2012-05-27 23:27 +0100
                Re: Proposed new Java feature Robert Klemme <shortcutter@googlemail.com> - 2012-05-28 12:22 +0200
                Re: Proposed new Java feature "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-27 21:43 -0700
                Re: Proposed new Java feature Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-05-29 14:32 +0000
  Re: Proposed new Java feature Tom Anderson <twic@urchin.earth.li> - 2012-05-27 18:43 +0100
  Re: Proposed new Java feature Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2012-06-02 12:41 -0700
    Re: Proposed new Java feature markspace <-@.> - 2012-06-02 15:55 -0700

csiph-web