Class Token

x.__init__(...) initializes x; see help(type(x)) for signature

Overrides: object.__init__

(inherited documentation)

Returns the time when the lock is acquired or None if cron already running

lock is implemented by writing a pickle (start, stop) in cron.master start is time when cron job starts and stop is time when cron completed stop == 0 if job started but did not yet complete if a cron job started within less than 60 seconds, acquire returns None if a cron job started before 60 seconds and did not stop, a warning is issue "Stale cron.master detected"