xyzshop/core/framework/libraries/CoRedisPool.php

<?php

class CoRedisPool extends CoPool
{
    const max_clients = 100;

    private static $stInstance = null;

    public static function instance()
    {
        if (self::$stInstance == null) {
            self::$stInstance = new CoRedisPool();
        }

        return self::$stInstance;
    }

    private function __construct()
    {
        parent::__construct(self::max_clients);
    }

    public function create_client($args)
    {
        return co_create_instance('Cache','connect',$args);
    }
}