# swoole_server->sendwait
阻塞地向客户端发送数据。
有一些特殊的场景，Server需要连续向客户端发送数据，而swoole_server->send数据发送接口是纯异步的，大量数据发送会导致内存发送队列塞满。
使用swoole_server->sendwait就可以解决此问题，swoole_server->sendwait会阻塞等待连接可写。直到数据发送完毕才会返回。
~~~
bool swoole_server->sendwait(int $fd, string $send_data);
~~~
> sendwait目前仅可用于SWOOLE_BASE模式
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