unity的www.dispose()卡死freeze bug

谁践踏了优雅 2022-07-18 00:25 183阅读 0赞

# unity的www.dispose()卡死freeze bug #

![unity][]

## 起因 ##

最近做gearvr开发时，发现了个画面卡死的问题，表现是画面播着播着突然渲染停止，看起来是主渲染线程被无限制卡死，当时只知道具体现象是可能与http请求有关，一直也没有定位到，而在editor模式下不会出现类似的问题，所以大概可以确定是在android平台上发生的。我的unity版本是5.3.4f1

## 调查 ##

最近仔细调试了一下，发现与www的dispose()有关，当然我代码是用的

using(WWW www = new WWW(url))

代码块这样的方式自动调用dispose，我试着直接调用`www.dispose()`也会有卡死的问题。确定了是dispose()的问题，就在网上看了一些其他人遇到类似的问题。这里我的http请求是服务器一直没有回应，无休止的pending，好吧~

[http://answers.unity3d.com/questions/1067499/bug-wwwdispose-when-called-before-wwwisdone-true-f.html][http_answers.unity3d.com_questions_1067499_bug-wwwdispose-when-called-before-wwwisdone-true-f.html]

[https://issuetracker.unity3d.com/issues/ios-app-freezes-if-www-is-loaded-with-403-url-and-www-dot-dispose-is-called][https_issuetracker.unity3d.com_issues_ios-app-freezes-if-www-is-loaded-with-403-url-and-www-dot-dispose-is-called]

[https://issuetracker.unity3d.com/issues/unity-freezes-when-www-dot-dispose-is-used-while-downloading-assetbundle][https_issuetracker.unity3d.com_issues_unity-freezes-when-www-dot-dispose-is-used-while-downloading-assetbundle]

[https://issuetracker.unity3d.com/issues/android-application-freezes-on-www-dot-dispose-if-connection-is-canceled][https_issuetracker.unity3d.com_issues_android-application-freezes-on-www-dot-dispose-if-connection-is-canceled]

大体上说法就是当调用`www.dispose()`时，如果之前的请求还没结束，那么可能就会发生阻塞卡死，因为是在协程中调用，如果发生阻塞一样会导致主渲染线程阻塞，大概卡死1分多钟吧。

## 解决方案 ##

要么就不要去调用dispose了，要么换个实现方式吧，比如besthttp插件，哈哈我觉得至少比www使用起来舒服很多。

坑总是很多的，还是要想办法定位和解决。

[unity]: /images/20220717/73051fb521754a4b95cfbc4499f229da.png
[http_answers.unity3d.com_questions_1067499_bug-wwwdispose-when-called-before-wwwisdone-true-f.html]: http://answers.unity3d.com/questions/1067499/bug-wwwdispose-when-called-before-wwwisdone-true-f.html
[https_issuetracker.unity3d.com_issues_ios-app-freezes-if-www-is-loaded-with-403-url-and-www-dot-dispose-is-called]: https://issuetracker.unity3d.com/issues/ios-app-freezes-if-www-is-loaded-with-403-url-and-www-dot-dispose-is-called
[https_issuetracker.unity3d.com_issues_unity-freezes-when-www-dot-dispose-is-used-while-downloading-assetbundle]: https://issuetracker.unity3d.com/issues/unity-freezes-when-www-dot-dispose-is-used-while-downloading-assetbundle
[https_issuetracker.unity3d.com_issues_android-application-freezes-on-www-dot-dispose-if-connection-is-canceled]: https://issuetracker.unity3d.com/issues/android-application-freezes-on-www-dot-dispose-if-connection-is-canceled