June 21, 2006

How little I know ;)

Writing about web page http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html

I was having a technical chat with Rob Harrop of Interface21 fame and we got talking about java synchronisation and the farce that is double checked locking, both concepts I thought I had a handle on.

Anyways, I decided to do a bit more reading and am astounded at how much I don't know :) Admittedly I don't feel too bad about this because I have never explicitly looked at these in depth, but here are some interesting links:

link
link

I thought I knew quite a bit about java until I spoke to Rob :)


- 3 comments by 2 or more people Not publicly viewable

  1. Chris May

    ISTR reading somewhere that either Java 5 or 6 had fixed the memory model, to the point where a DCL implementation was now possible even on multiprocessor machines – did Rob refer to this at all?

    Personally, though, I've never come across a situation where synchronizing was both necessary and not performant enough – though I don't write frameworks so that's probably why

    21 Jun 2006, 13:30

  2. Chris May

    link

    As of J2SE 5.0, this problem has been fixed. The volatile keyword now ensures that multiple threads handle the singleton instance correctly. This new idiom is described in

    21 Jun 2006, 13:37

  3. Yeah, I thought Java 5 had fixed it as well….. I almost certainly misunderstood Rob's point then :)

    21 Jun 2006, 13:44


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