First version of dogpile deadlock fix and test. #132
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Need test refactoring.
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Fix for the issue #128
I added tests both for the dogpile lock behavior (this part of the code was not tested) and for the dogpile lock deadlock.
The tests are still messy, especially because I used thread to be able to simulate the lock. I'll try to clean up a little bit the tests when I have a bit more time to work on this.