This module implements a mechanism to limit the number of concurrent processes in a cooperative multiprocessing environment. This is an alternative to, for example, running several daemons.
Roughly speaking, a typical setup would be the following:
Cron starts a new process every minute.
The process attempts to get a lock as shown in synopsis.
If it obtains a lock, it starts working and exits when the work is done.
If not, "max_procs" processes are already working, so it exits.