I am trying to figure out issue with thread application.Basically i want a thread which sends data to pipeline and other thread gets data from pipeline and consume it. Issue is below code works fine :

use Thread::Queue;
use threads;

my $q = Thread::Queue->new();    # A new empty queue

print "$q\n"; 
my $command = "ls -la";
print ("sending command...\n");
$q->enqueue($command);    
#sleep(60);
$command = "pwd";    
print ("sending command...\n");
$q->enqueue($command);
#sleep(60);
$q->end();    
 
# Worker threads
my $thr =  threads->create(sub {
    print "running thread : $q\n";
    while ((my $item = $q->dequeue())) 
     {
        print "Running Command : $item \n";
        my $result = `$item 2>&1`;
        print "Result of $item : $result \n";
     }
} ) ;

# terminate.
$thr->join();
[download]

The below code is similar to above one excepts use a function to send data and call that function in another thread but it doesn't work:

#!/usr/bin/perl

use Thread::Queue;
use threads;
use threads::shared;

my $q ; 
share($q);
$q = Thread::Queue->new();

my $thr1 =  threads->create(sub {
    my ($q) = @_;
    print "Running Thread1 : $q\n"; 
    my $command = "ls -la";
    print ("sending command...\n");
    $q->enqueue($command);    
    #sleep(60);
    $command = "pwd";    
    print ("sending command...\n");
    $q->enqueue($command);
    #sleep(60);
    $q->end();
} , $q) ;

# Worker threads
my $thr2 =  threads->create(sub {
    my ($q) = @_;
    print "running thread2 : $q\n";
    while ((my $item = $q->dequeue())) 
     {
        print "Running Command : $item \n";
        my $result = `$item 2>&1`;
        print "Result of $item : $result \n";
     }
} ,$q) ;

$thr1->join();
$thr2->join();

print "Done\n";
[download]

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