Mac

+[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. 解决方法

Posted by Ivan on 2018-09-11

最近在用python3写一个多线程工具,发现频繁报错:

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objc[27880]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[27880]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

一直以为是代码的问题,不断的检查代码,其实是macOS的High Sierra以上的操作系统对多线程的限制,别无其它原因。

临时调试方法

在终端中输入 export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

不要关闭当前终端,再次运行python程序

解决方法

打开终端 输入

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cd ~
sudo vim .bash_profile

在最后一行加入

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export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

重启终端就解决了。