In the attached code, I am trying to reference a hash contained in an array. However, each time I try to reference the hash, it says it is not a Hash. I'm following the examples with no luck. Can you help? Specifically with the ftp_sessions() array. Thanks This code is being put together to monitor multiple, long-running FTP jobs. I don't have that code in here ... basically stubbing it out with sleep statements. 
#!/usr/local/bin/perl -w
######################################################################
+####################################
#                                                                     
+                                   #
#  Program:  GetDCBillingsFiles                                       
+                                   #
#                                                                     
+                                   #
#  Description:  Programs collects DC billings files from all the serv
+ers located at the DC.  This       #
#                script is NOT intended to be a production application
+.                                  #
#                                                                     
+                                   #
#  Date:  12/27/03                                                    
+                             #
#                                                                     
+                                   #
######################################################################
+####################################

use strict;
use threads;

# Define global variables for program. 
my @locations = ();
my @ftp_sessions = ();

my $INTERVAL = 5;
my $ACTIVE = 1;
my $INACTIVE = 0;
 
######################################################################
+####################################
#                                                                     
+                                   #
#  Subroutine:  monitor_ftp                                           
+                                   #
#                                                                     
+                                   #
#  Description:  Subroutine collects information about active FTP sess
+ions.                              # 
#                                                                     
+                                   #
######################################################################
+####################################
sub monitor_ftp()
{
    my $nbr = 0;
    my $status = 'status';
    my $active_sessions = 0;

    sleep 1;
    print "Monitoring FTP sessions ... \n\n\n";
    #printf "Sessions status <%d> and location <%s>\n", $ftp_sessions[
+0]->{status}, $ftp_sessions[0]->{loc};

     do    
    {
        my $session;
        $active_sessions = 0;

        for $session (@ftp_sessions)
        {
            $active_sessions += 1;
            $nbr++;
        }

        print "Active Sessions: $active_sessions\n";

        # Check the list size and exit if all threads are complete.
        if ($active_sessions > 0)
        {
            # Monitor the sessions at fixed intervals.
            sleep $INTERVAL;
        }

    } until $active_sessions == 0;

}


######################################################################
+####################################
#                                                                     
+                                   #
#  Subroutine:  start_ftp                                             
+                                   #
#                                                                     
+                                   #
#  Description:  Subroutine starts FTP sessions to collect data from l
+ocations.                          # 
#                                                                     
+                                   #
######################################################################
+####################################
sub start_ftp($$)
{
    my ($nbr, $location) = @_;
    my $id = threads->self->tid;

    printf "FTP session: <%d> <%s>\n", $id, $location;    
    $ftp_sessions[$nbr] = { status => 1, loc => $location };


    ############# Insert FTP commands here ########################
    my $time_delay = $id*5;
    sleep $time_delay; 
    ############# Insert FTP commands here ########################



    # Session complete. Reset the status and exit the session.
    $ftp_sessions[$nbr]{status} = 0;

    printf "Session <%d> complete.\n", $id; 
}


######################################################################
+####################################
#                                                                     
+                                   #
#  Main Routine                                                       
+                                   #
#                                                                     
+                                   #
######################################################################
+####################################

$locations[0] = "awd1";

# Loop through the locations, starting a process to extract the data r
+equired from each DC.
my $loc = 0;
my $nbr = 0;

foreach $loc (@locations)
{
    # Use threads to manage the FTP sessions.
    $ftp_sessions[$nbr] = threads->create("start_ftp", $nbr, $loc);
    $nbr++;
}

monitor_ftp();
sleep 40;

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In reply to data structure question by mjmaresca

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