QMutex 经常出错。
ps:本人小白，刚看 YouTube 教程发现 osx 下出错， win 下正常。然后搜索了一下，发现 stackoverflow 上也有人抱怨说
On Mac OS X I had QMutex hangs even in a 100% correct logic.
Note however, this problem only occurred on OS X in my case. On Windows the same code was working perfectly.
ps:本人小白，刚看 YouTube 教程发现 osx 下出错， win 下正常。然后搜索了一下，发现 stackoverflow 上也有人抱怨说
On Mac OS X I had QMutex hangs even in a 100% correct logic.
Note however, this problem only occurred on OS X in my case. On Windows the same code was working perfectly.
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