Hi, I had same problem as you, so I created own spawn subroutine, with more pseudoterminals. I using it for parallel connection to servers:

Constructor: 

sub new
{
    my $class = shift;
    my $self = {};
    bless $self, $class;

    my $log = Log::Log4perl->get_logger("$class");
    $self->{LOGGER} = $log;

    my $pty = $self->spawn("/bin/bash");  # spawn() defined below
    $self->{PTY} = $pty;
    my $exp = Expect->exp_init($pty);

    my $ref = $exp->expect(TIMEOUT,
        [ $shell_prompts ]
    );
    if (!$ref){
        $log->warn("Timeout received!");
        return -1;
    } 

    $exp->clear_accum();

    #$exp->log_stdout(1);
    $exp->raw_pty(1);
    #$exp->debug(3);
    $Expect::Multiline_Matching = 0 ;

    $self->{EXPECT} = $exp;

    $log->debug("Creating instance $class");
    return $self;
}

[download]
SPAWN subroutine: 
sub spawn {

    my($cmd) = @_;
    my($pid, $pty, $tty, $tty_fd);

    ## Create a new pseudo terminal.
    $pty = new IO::Pty
        or die $!;

    ## Execute the program in another process.
    unless ($pid = fork) {  # child process
        die "problem spawning program: $!\n" unless defined $pid;

        ## Disassociate process from existing controlling terminal.

        use POSIX ();
        POSIX::setsid
            or die "setsid failed: $!";

        ## Associate process with a new controlling terminal.
        $tty = $pty->slave;
        $pty->make_slave_controlling_terminal();
        $tty_fd = $tty->fileno;
        close $pty;

        ## Make stdio use the new controlling terminal.
        open STDIN, "<&$tty_fd" or die $!;
        open STDOUT, ">&$tty_fd" or die $!;
        open STDERR, ">&STDOUT" or die $!;
        close $tty;

        ## Execute requested program.
        exec "/bin/bash"
        #exec $cmd
            or die "problem executing /bin/bash\n";

    } # end child process

    return $pty;
} # end sub spawn

[download]
Then you can create new expect process in you each child in your main method : 
my $pm = new Parallel::ForkManager(5);
for (1...10) {
    my $pid = $pm->start and next;
    my $exp = Expect_common->new();
    # expect send
    ...
    #
    $pm->finish; # Terminates the child process
}
$pm->wait_all_children;

[download]

In reply to Re: Using Perl Threads with Expect.pm by olibertu
in thread Using Perl Threads with Expect.pm by vishi

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