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while(true)导致协程不会立即退出

### 问题描述
while（true）协程不会立即退出
### Swoole版本，PHP版本，以及操作系统版本信息
PHP 7.4.7 (cli) (built: Jun 12 2020 00:04:10) ( NTS )
swoole

Swoole => enabled
Author => Swoole Team <team@swoole.com>
Version => 4.5.5
Built => Oct 22 2020 13:07:00
coroutine => enabled
kqueue => enabled
rwlock => enabled
openssl => OpenSSL 1.1.1g  21 Apr 2020
http2 => enabled
pcre => enabled
zlib => 1.2.11
brotli => E16777223/D16777223
async_redis => enabled

### 相关代码
```php
<?php
//复现代码
use Swoole\Coroutine\Channel;
Co::set(['hook_flags'=> SWOOLE_HOOK_ALL]);
Co\run(function(){

function aa($data, $fd){
    if (empty($GLOBALS['ffmpeg'][$fd])){
      echo 'process'."\n";
      $Channel = new Channel();
      $GLOBALS['ffmpeg'][$fd] = &$Channel;
      $shell = '/usr/local/bin/ffmpeg -f alaw -ar 8000 -ac 1 -i -  -c:a aac -f flv -';
      go(function () use($Channel, $shell){
          defer(function (){
              echo "退出携程\n";
          });
          $descriptorspec = [
              0 => ['pipe', 'r'],
              1 => ['pipe', 'w'],
              2 => ['file', '/tmp/aa2s.txt', 'a'],
          ];
          $process = proc_open($shell, $descriptorspec, $pipes);
          stream_set_blocking($pipes['1'], false);

while ($data = $Channel->pop()){
              // fwrite($pipes[0], $data);
              // fread($pipes[1], 1024);
          }
          fclose($pipes[0]);
          fclose($pipes[1]);
          proc_close($process);
          echo '进程结束'."\n";
      });
      $GLOBALS['ffmpeg'][$fd]->push($data);

}else{
        $GLOBALS['ffmpeg'][$fd]->push($data);
    }
  }

for ($i=0; $i < 10000; $i++) { 
    aa('11', 1);
    $GLOBALS['ffmpeg'][1]->close();
  }

while(true){
    
  }
  
});
```

### 你期待的结果是什么？实际看到的错误信息又是什么？
协程立即退出。我看到协程不会立即退出，等创建下一个协程的时候上一个才退出

发布于4年前 · 6 次浏览 · 来自提问