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threads::shared - writing

• Locking the variables to write them:

      use threads::shared;  # imports 'lock'
  
      {
          lock($g_remote_ip);
          lock($g_remote_port);
          $g_remote_ip   = $ipquad;
          $g_remote_port = $tcp_port;
      } # lock goes out of scope here
  

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