发表新帖

在使用协程+通道+waitgroup 遇到 channel::pop()报错问题

### 问题描述
PHP Fatal error:  Swoole\Coroutine\Channel::pop(): you must call Channel constructor first in @swoole-src/library/core/Coroutine/WaitGroup.php on line 61

### Swoole版本，PHP版本，以及操作系统版本信息
swoole : 4.5.2 / 4.4.19
php:7.2
os:ubuntu20.04

### 相关代码
```php
if (!extension_loaded('swoole')) {
    die('Abort ' . basename(__FILE__) . ' : Missing swoole extensions');
}
echo "swoole-并发执行采集-开始\n";
$requestUrl = "https://cn.bing.com/search?q=urldecode";
$urlArr = parse_url($requestUrl);
$host = $urlArr['host'];
$port = isset($urlArr['port']) ? $urlArr['port'] : 80;
$uri = sprintf("%s", $urlArr['path'], $urlArr['query']);

Co::set(['hook_flags' => SWOOLE_HOOK_ALL | SWOOLE_HOOK_CURL]);

Co\run(function () use ($host, $port, $uri) {
    $inWg = new Swoole\Coroutine\WaitGroup();
    $outWg = new Swoole\Coroutine\WaitGroup();
    $inChan = new Swoole\Coroutine\Channel(10);
    $outChan = new Swoole\Coroutine\Channel(10);
    $stChan = new Swoole\Coroutine\Channel(1);

for ($i = 1; $i <= 10 $i++) {
        $inWg->add();
        go(function () use ($host, $port, $uri, $i, $inChan, $outChan, $inWg, $stChan) {
            while(1){
                if($stChan->pop() === "done"){
                    echo "st协程:close->out协程{$i}:close\n";
                    break;
                }

$pg = $inChan->pop();
                if ($pg === false) {
                    echo "in协程:close->out协程{$i}:close\n";
                    break;
                }

$cli = new Swoole\Coroutine\Http\Client($host, $port);
                $cli->set(
                    array(
                        'timeout' => 3
                    )
                );

$cli->setHeaders(
                    array(
                        'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36',
                    )
                );

$uri = sprintf("%s&page=%d", $uri, $pg);
                $cli->get($uri);
                $html = $cli->body;
                $cli->close();

if(strlen($html) > 0){
                    $outChan->push(array($pg, $html)) ;
                }else{
                    $inChan->push($pg);
                }

//出让协程执行
                co::sleep(0.05);
            }
            $inWg->done();
        });
    }

for ($j = 1; $j <= 10; $j++) {
        $outWg->add();
        go(function () use ($j, $outChan, $outWg, $stChan) {
            while(1){
                if($stChan->pop() === "done"){
                    echo "status协程:close->out协程{$j}:close\n";
                    break;
                }

$data = $outChan->pop();

if ($data === false) {
                    echo "out协程:close->out协程{$j}:close\n";
                    break;
                }

$filePath = sprintf("./file/%d.log", $data[0]);
                $ret = file_put_contents($filePath, $data[1]);
                $len = strlen($data[1]);
                echo "out协程-{$j}->写入文件{$filePath}->size:{$len}->ret:{$ret}\n";
                co::sleep(0.05);
            }
            $outWg->done();
        });
    }

//提交初始数据
    for ($i = 1; $i <= 100;  $i++) {
        $inChan->push($i);
    }

//等待协程执行完毕
    $inWg->wait();
    $outWg->wait();

//关闭监控通道
    $stChan->push("done");
    $stChan->close();

//关闭中间数据通道
    $outChan->close();
    $inChan->close();
});

echo "swoole-并发执行采集-结束\n";
```
### 你期待的结果是什么？实际看到的错误信息又是什么？
是否我上述的用法不对呢？,希望能正常自动完成10页数据的输出内容到文件中, 错误在上面。

发布于6年前 · 7 次浏览 · 来自提问

紫檀v2