There are several other modules to do this, you probably want one of them. This
module exists as a super-specialized parallel task manager. You create the
object with a process limit and callbacks for what to do while waiting for a
free process slot, as well as a callback for what a process should do just
before exiting.

You must explicitly call $runner->finish() when you are done. If the runner is
destroyed before its children are finished, a warning will be generated and
your child processes will be killed, by force if necessary.

If you specify a maximum of 1 then no forking will occur, and run() will block
until the coderef returns. You can force a fork by providing a boolean true
value as the second argument to run(), which will force the runner to fork
before running the coderef; however, run() will still block until the child
exits.

• Igor Vlasenko

• perl-Parallel-Runner