New importer redundantly reloading modules.

                 Key: MODPYTHON-219
             Project: mod_python
          Issue Type: Bug
          Components: importer
    Affects Versions: 3.3.1
            Reporter: Graham Dumpleton
             Fix For: 3.3.x

Although the new module importer prevents two threads trying to load a module 
at the same time, the transition from checking to see if a module requires 
(re)loading to the actual loading isn't properly thread protected and as a 
result a second thread, although it may decide a module needs (re)loading, 
isn't simply waiting for the first thread to finish the loading and use the 
result of that and is instead loading the module again even though no change 
has been made.

This issue was highlighted in following mailing list posts:

Further discussion can be found in the associated posts for that thread in the 

Note that this only affects multithreaded Apache MPMs and the window for this 
to happen is very small and is only going to occur under heavy load from 
multiple clients or in web pages where multiple requests may be made from a 
page to a resource requiring the same code module be loaded.

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