# swoole_process->read 从管道中读取数据。 ~~~ int swoole_process->read(int $buffer_size=8192); ~~~ $buffer_size是缓冲区的大小，默认为8192，最大不超过64K > 这里是同步阻塞读取的，可以使用[swoole_event_add](#)将管道加入到事件循环中，变为异步模式 示例： ~~~ function callback_function_async(swoole_process $worker) { $GLOBALS['worker'] = $worker; swoole_event_add($worker->pipe, function($pipe) { $worker = $GLOBALS['worker']; $recv = $worker->read(); echo "From Master: $recv\n"; //send data to master $worker->write("hello master\n"); sleep(2); $worker->exit(0); }); } ~~~ |  Swoole流程 | |-----|