use strict;
use warnings;

print "Starting main program\n";
my @childs;

for ( my $count = 1; $count <= 3 ; $count++) {
my $pid = fork();
if ($pid) {
# parent
print "pid is $pid, parent $$\n";
push(@childs, $pid);
} elsif ($pid == 0) {
# child
sub1($count);
exit 0;
} else {
die "couldnt fork: $!\n";
}



}

foreach (@childs) {
my $tmp = waitpid($_, 0);
print "done with pid $tmp\n";

}

print "End of main program\n";


sub sub1 {
my $num = shift;
print "started child process for $num\n";
sleep $num;
print "done with child process for $num\n";
return $num;
}