I am trying to utilize threads and non-blocking IO but have run into a stumbling block. I have a separate thread monitoring STDIN via Term::Readkey. After some time I create another thread to do non-related processing but this thread hangs at creation time until something happens (i.e. a key is pressed) in the first thread (read_in). Am I creating threads incorrectly or is there something else blocking the proc_it thread below? Code was modified from a nonblocking IO post by zentara. This code will hang at count = 10 until something is read from the command prompt. How do I avoid this block? 
#!/usr/bin/perl
use warnings;
use strict;
use Term::ReadKey;
use threads;

$|++;
ReadMode('cbreak');

# works non-blocking if read stdin is in a thread
my $count = 0;
my $thr = threads->new(\&read_in)->detach;

while(1){
  print "test, count:$count\n";
  sleep 1;
  if ($count == 10) {
    my $thr_proc = threads->new(\&proc_it)->detach;
  }
  $count++;
}

ReadMode('normal'); # restore normal tty settings


sub proc_it{
  while(1) {
    print "@";
    sleep 2;
  }
}


sub read_in{
  while(1){
    my $char;
      if (defined ($char = ReadKey(0)) ) {
        print "\t\t$char->", ord($char),"\n";    
        if($char eq 'q'){exit}
      }
  }
}

__END__

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In reply to Non-blocking IO and threads by PhillyR

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