python GIL

今天跑python多线程出了个奇怪的crash：
Fatal Python error: PyThreadState_Get: the function must be called with the GIL held, but the GIL is released (the current Python thread state is NULL)

找到如下参考：
https://superfastpython.com/thread-race-condition-shared-variable/
https://realpython.com/python-parallel-processing/
https://www.jianshu.com/p/573aaa001b35

然后研究了半天，发现是有个线程因为崩溃，导致了这个问题，然后崩溃的log也没有打出来，还以为是GIL的问题。

迫使自己看了下GIL，又多了解一个python的限制了。