Function ap_process_async_request

modules/http/http_request.c:407–478

}

void ap_process_async_request(request_rec *r)
{
    conn_rec *c = r->connection;
    int access_status;

    /* Give quick handlers a shot at serving the request on the fast
     * path, bypassing all of the other Apache hooks.
     *
     * This hook was added to enable serving files out of a URI keyed
     * content cache ( e.g., Mike Abbott's Quick Shortcut Cache,
     * described here: http://oss.sgi.com/projects/apache/mod_qsc.html )
     *
     * It may have other uses as well, such as routing requests directly to
     * content handlers that have the ability to grok HTTP and do their
     * own access checking, etc (e.g. servlet engines).
     *
     * Use this hook with extreme care and only if you know what you are
     * doing.
     */
    AP_PROCESS_REQUEST_ENTRY((uintptr_t)r, r->uri);
    if (ap_extended_status) {
        ap_time_process_request(r->connection->sbh, START_PREQUEST);
    }

    if (APLOGrtrace4(r)) {
        int i;
        const apr_array_header_t *t_h = apr_table_elts(r->headers_in);
        const apr_table_entry_t *t_elt = (apr_table_entry_t *)t_h->elts;
        ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r,
                      "Headers received from client:");
        for (i = 0; i < t_h->nelts; i++, t_elt++) {
            ap_log_rerror(APLOG_MARK, APLOG_TRACE4, 0, r, "  %s: %s",
                          ap_escape_logitem(r->pool, t_elt->key),
                          ap_escape_logitem(r->pool, t_elt->val));
        }
    }

#if APR_HAS_THREADS
    apr_thread_mutex_create(&r->invoke_mtx, APR_THREAD_MUTEX_DEFAULT, r->pool);
    apr_thread_mutex_lock(r->invoke_mtx);
#endif
    access_status = ap_run_quick_handler(r, 0);  /* Not a look-up request */
    if (access_status == DECLINED) {
        access_status = ap_process_request_internal(r);
        if (access_status == OK) {
            access_status = ap_invoke_handler(r);
        }
    }

    if (access_status == SUSPENDED) {
        /* TODO: Should move these steps into a generic function, so modules
         * working on a suspended request can also call _ENTRY again.
         */
        AP_PROCESS_REQUEST_RETURN((uintptr_t)r, r->uri, access_status);
        if (ap_extended_status) {
            ap_time_process_request(c->sbh, STOP_PREQUEST);
        }
        if (c->cs)