python3-dogpile.core 0.4.1+dfsg1-3 (amd64 binary) in ubuntu xenial

 Python dogpile.core lock allows a single thread to generate an expensive
 resource while other threads use the old value, until the new"value is ready.
 .
 Dogpile is basically the locking code extracted from the Beaker package, for
 simple and generic usage.
 .
 This package provides the Python 3.x module.