is it possible to connect to memcached and check in access phase?

[Huy Phan]

Hi Manilo,

Thank you for your quick reply :)
I'm checking the source code of some memcached client from 
google code. 
Hope I can find something here.
In fact I've already used the code of ngx_http_memcached_module
(using upstream) for my workflow, and it works, but not in the 
access phase.
I still don't get the point when you said we can use 
asynchronous in access phase. Because the code is something 
like this :

ngx_int_t    rc;

static ngx_int_t 
ngx_http_mymodule_handler(ngx_http_request_t *r)
{
    ngx_http_mymodule_request_init(r);       

    // Do something to let this function wait here 
    // until the callback is done

    // Now I got the result
    if (rc) 
        return NGX_HTTP_OK;
    else return NGX_HTTP_FORBIDDEN;
}

void 
ngx_http_mymodule_callback_function(ngx_http_request_t *r)
{
    // leave the data to rc;
}

How can the handler function wait for the result of 
callback function in this case ?