在 Swoole 协程中操作变量时，是否需要加锁以确保变量的安全性？

use SwooleRuntime;use SwooleCoroutine;use SwooleCoroutineWaitGroup;// 协程变量安全Runtime::enableCoroutine();SwooleCoroutineun(function () {    $wg = new WaitGroup();    $count = 0;    foreach (range(1, 20000) as $num) {        $wg->add();        Coroutine::create(function () use ($wg, &$count) {            Coroutine::sleep(rand(2, 5));            // var_dump(Coroutine::getuid());            $count += 1;            $wg->done();        });    }    $wg->wait();    var_dump($count);});