Re^2: Need help with Perl multi threading

[ashok.g]

Hi Corion,

Thanks for your reply. Main code:

#!/usr/bin/perl

use threads;
use strict;
use warnings;
use Net::SSH::Expect;
require 'total.pl';

my @servers = ('192.168.0.18','192.168.0.19','192.168.0.20');
my @process = ('testing','b','c');
my @threads;
my $output;
my $res;
foreach my $host ( @servers )
{
    my $png = `ping -c1 $host`;
    if ( $png =~ /64 bytes/ )
    {
        my $user= 'netcool';
                my $ssh = &SSH_Reference($host,$user);
        $ssh->run_ssh();
                eval {$res=$ssh->read_all(); };
        if ( !$@ && $res !~ /\(yes\/no\)/ && $res !~ m/password/ )
        {
            print "\nLogged in to $host\n";
                foreach my $proc ( @process ) 
                {
                    push (@threads, threads->new(\&Process_Output, $ss
+h, $proc ));
                    while ( my $thread = shift @threads )
                    {
                        $output=$thread->join();
                        #print @output;
                        if ( $output =~ m/$proc/ )
                                        {
                                                print "\t$proc is runn
+ing\n";
                                        }
                                        else
                                        {
                                                print "\t$proc is not 
+running\n";
                                        }
                    }
                }
            $ssh->close();
        }
        else
        {
            print "Unable to SSH to $host\n";
        }
    }
    else
    {
        print "\nUnable to ping to Host: $host\n";
    }
}

total.pl:

use Config::General;
use Tie::IxHash;
use Net::SNMP;

sub SSH_Reference()
{
    ($host,$user)=@_;
    #print "$host---$user--\n";
    #($host,$user)= @_;
    $ssh = Net::SSH::Expect->new (
        host => $host,
        user => $user,
        timeout=>10,
        raw_pty => 1
    );
    return $ssh;
}

sub Process_Output()
{
    $ssh = shift;
    $process = shift;
    #( $ssh, $process ) = @_;
    $output;
    $ssh->eat($ssh->peek(0));
    $ssh->send("ps -ef | grep $process | grep -v 'grep'");
    while ( defined ($line = $ssh->read_line(2)) )
    {
        next if ( $line =~ m/grep/ );
        $output .= "$line";
    }
    $ssh->eat($ssh->peek(0));
    return $output;
}

1;

And the output is:

perl some.pl 

Logged in to 192.168.0.18
Use of uninitialized value in pattern match (m//) at some.pl line 33.
    testing is not running
Thread 2 terminated abnormally: SSHConnectionAborted at total.pl line 
+25
Use of uninitialized value in pattern match (m//) at some.pl line 33.
    b is not running
Thread 3 terminated abnormally: SSHConnectionAborted at total.pl line 
+25
Use of uninitialized value in pattern match (m//) at some.pl line 33.
    c is not running

Logged in to 192.168.0.19
Segmentation fault

Please suggest

Thanks,
Ashok