在select的構(gòu)造函數(shù)中,有如下代碼

<?php
// Create a pipeline and put into the collection of the read to read the descriptor to avoid empty polling.
        $this->channel = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
        if ($this->channel) {
            stream_set_blocking($this->channel, 0);
            $this->_readFds = $this->channel;
        }
?>

這個(gè)創(chuàng)造出來的一對(duì)套接字,一般是被用來進(jìn)行進(jìn)程間通信的,但是一般的使用方式是這樣

<?php
$sockets = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$pid     = pcntl_fork();
if ($pid == -1) {
     die('could not fork');
} else if ($pid) {
     /_ parent _/
    fclose($sockets);
    fwrite($sockets, "child PID: $pid\n");
    echo fgets($sockets);
    fclose($sockets);
} else {
    /_ child _/
    fclose($sockets);
    fwrite($sockets, "message from child\n");
    echo fgets($sockets);
    fclose($sockets);
}
?>

使用一對(duì)套接字,在進(jìn)程分裂的時(shí)候每個(gè)進(jìn)程擁有其副本,然后互相發(fā)送,可以得到消息
但是workerman中的stream_socket_pair的創(chuàng)建是在子進(jìn)程分裂之后,的run中,才給每一個(gè)子進(jìn)程創(chuàng)建一對(duì)stream_socket_pair,而且只在_readFds中加入了channel的第一個(gè),另外一個(gè)不知道用到哪兒了,請(qǐng)問walkor老大,這樣做是什么目的啊,每看明白