start/fork duplicates the current process, and both the original process (parent) and the copy (child) continue executing from that same point 
#!/usr/bin/perl --

use strict;
use warnings;

use Parallel::ForkManager;


my $pm = new Parallel::ForkManager(3);
for my $data ( 0 .. 2 ){
    my $pid = $pm->start and next; ## WITH NEXT
#    my $pid = $pm->start ;        ## WITHOUT NEXT
    print "data ($data) pid ($pid) \$\$($$)\n";
    $pm->finish; # Terminates the child process
}
__END__

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The above program (with next) outputs 
data (0) pid (0) $$(-1792)
data (1) pid (0) $$(-1856)
data (2) pid (0) $$(-1916)

[download]
The above program modified (without next) outputs 
data (0) pid (-1944) $$(1992)
data (1) pid (-1656) $$(1992)
data (1) pid (0) $$(-1656)
data (0) pid (0) $$(-1944)
data (2) pid (-1924) $$(1992)
data (2) pid (0) $$(-1924)

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When pid is 0, it is the child process, when it is not zero, it is the parent process.

Fork (operating system)

Mr. Peabody Explains fork()

In reply to Re^2: Stop fork in Parallel::ForkManager by Anonymous Monk
in thread Stop fork in Parallel::ForkManager by casimo

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