## Coroutine::list 遍历当前进程内的所有协程。 ~~~ function Coroutine::list() : Coroutine\Iterator function Coroutine::listCoroutines() : Coroitine\Iterator ~~~ * 返回迭代器，可使用`foreach`遍历，或使用`iterator_to_array`转为数组 ~~~ $coros = Coroutine::listCoroutines(); foreach($coros as $cid) { var_dump(Coroutine::getBackTrace($cid)); } ~~~