[Opensource] thread safety

[larry hamel]

hi,

Several multithreading problems are fixed in latest cvs, for example in SecuredDBObject, where LRU caches are read/write and therefore needed to be synchronized (as opposed to a simple, non-LRU cache where writing only takes place at initialization, only reading thereafter, which could be done with a standard HashMap and careful sync in initialization).

There is a new note about thread safety & concurrent programming in the EDG.  When a developer creates a datamember in a controller (I've seen this happen), do they realize the potential pitfalls when writing in a servlet context?  Chapter 6 talks about all the benefits of using controllers, so I added a "pitfalls" segment on being cautious with thread safety.  (However, I can get that xmldocs target to run right now, so I can't see how the xml will be formatted.)

Running a load test on a 4-CPU server is a great way to find thread-unsafe code :-)

larry