使用swoole实现生产者消费者模型（2）

之前实现过一个swoole生产者消费者模型，有兴趣可以参看这里，这版代码做了如下修改：
1. 生产者放到单独子进程当中，而非像之前那样在主( 父)进程中完成。 虽然功能上没有什么变化，但这样看起来结构更合理一些。
2. 主进程除了生成不同子进程外，还做了一件事：回收僵尸进程。如果程序是长期运行的，这点还是有必要的。

代码如下：

<?phpabstract class Schedule{    protected $_consumerList = array();    protected $_msgqkey = null;    protected $_consumerNum = 2;    protected $_finishFlag = 'ALLDONE';    public function __construct($cNum = 0){        if ($cNum){            $this->_consumerNum = $cNum;        }    }    public function setConsumerNum($num = 0){        if ($num){            $this->_consumerNum = $num;            return true;        }        return false;    }    public function setFinishFlag($flag = null){        if ($flag){            $this->_finishFlag = $flag;            return true;        }        return false;    }    public function run(){        $this->_consumerList = array();        for($i=0; $i<$this->_consumerNum; $i++){            $consumer = new swoole_process(function($worker){                $this->_consumerFunc($worker);            });            if ($this->_msgqkey){                $consumer->useQueue($this->_msgqkey);            }            else{                $consumer->useQueue();            }            $pid = $consumer->start();            $this->_consumerList[$pid] = $consumer;        }        $producer = new swoole_process(function($worker){            echo "producer begin:\n";            $this->_producerFunc($worker);        });        if ($this->_msgqkey){            $producer->useQueue($this->_msgqkey);        }        else{            $producer->useQueue();        }        $pid = $producer->start();        echo sprintf("msgqkey:%s\n", $producer->msgQueueKey);        //回收僵尸子进程        swoole_process::signal(SIGCHLD, function($sig){            static $num = 0;            while($ret = swoole_process::wait(false)){                echo "master clear pid:{$ret['pid']}, code:{$ret['code']}\n";                $num++;                if ($num == $this->_consumerNum + 1){                    swoole_event_exit();                }                //echo $num,"\n";            }        });    }    protected function _producerFunc($worker){        if ($this->_onlyConsume()){            return;        }        foreach ($this->doProduce($worker) as $data){            $worker->push($data);        }        //任务数据被取完        while(true){            $c = $worker->statQueue();            $n = $c['queue_num'];            if ($n === 0){                break;              }        }        //放入consumer进程结束标识        foreach($this->_consumerList as $pid => $w){            $w->push($this->_finishFlag);        }        //确认结束        while(true){            $c = $worker->statQueue();            $n = $c['queue_num'];            if ($n === 0){                break;              }        }        $worker->freeQueue();    }    protected function _consumerFunc($worker){        while(1){            $data = $worker->pop();            if ($data == $this->_finishFlag){                $pid = $worker->pid;                echo "consumer $pid exit\n";                $worker->exit(0);            }            else{                $this->doConsume($data, $worker);            }        }    }    protected function _onlyConsume(){        return !! $this->_msgqkey;    }    abstract protected function doProduce($worker);    abstract protected function doConsume($data, $worker);}