[Exist-open] Concurrency issues with BTree classes

[Tom B. <bra...@db...>]

Hi Wolfgang and all,

I spent part of this week addressing concurrency issues in dbXML that 
were causing data corruption in the BTree system when many threads were 
accessing a Collection at one time.  I came up with a temporary solution 
that works, but isn't very elegant, and will likely be rewritten in a 
future version.

Because eXist uses some of the dbXML BTree code deep down, I thought I'd 
let you know.  If you're going to upgrade to it, you should be warned 
that I've moved *all* synchronization code to the higher level Filer 
classes.  This means that its the responsibility of the calling program 
to perform its own synchronization.  The lower level BTree code no 
longer does any.

--
Tom Bradford
The dbXML Project
Open Source Native XML Database
http://www.dbxml.org/