Add devel/py-portalocker: Python library that provides an easy API to file locking
An important detail to note is that on Linux and Unix systems the locks are
advisory by default. By specifying the -o mand option to the mount command it
is possible to enable mandatory file locking on Linux. This is generally not
recommended however. For more information about the subject:
https://en.wikipedia.org/wiki/File_locking http://stackoverflow.com/questions/39292051/portalocker-does-not-seem-to-lock https://stackoverflow.com/questions/12062466/mandatory-file-lock-on-linux