sebb wrote:
Where is that described? The first reference I found says that the
local variable is a performance optimisation; it's the volatile
keyword that makes it thread-safe:
http://technology.amis.nl/blog/4384/the-double-checked-locking-confusion
also
http://jeremymanson.blogspot.com/2008/05/double-checked-locking.html
But of course these could be wrong...
http://java.sun.com/developer/technicalArticles/Interviews/bloch_effective_08_qa.html
"The idiom is very fast but also complicated and delicate, so don't be
tempted to modify it in any way"
Stephen
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