# eio_poll

(PECL eio >= 0.0.1dev)

eio_poll — Can be to be called whenever there are pending requests that need finishing

### 说明

eio_poll ( void ) : int

eio_poll() can be used to implement special event loop. For this eio_nreqs() could be used to test if there are unprocessed requests.

> Note:

> Applicable only when implementing userspace event loop.

### 参数

此函数没有参数。

### 返回值

If any request invocation returns a non-zero value, returns that value. Otherwise, it returns `0`.

### 范例

Example #1 eio_poll() example

    <?php
    function res_cb($data, $result) {
        var_dump($data);
        var_dump($result);
    }

    eio_nop(EIO_PRI_DEFAULT, "res_cb", "1");
    eio_nop(EIO_PRI_DEFAULT, "res_cb", "2");
    eio_nop(EIO_PRI_DEFAULT, "res_cb", "3");

    while (eio_nreqs()) {
        // Some specific IPC or so
        eio_poll();
    }
    ?>

以上例程的输出类似于：

    string(1) "1"
    int(0)
    string(1) "3"
    int(0)
    string(1) "2"
    int(0)

### 参见

- eio_nreqs