[issue38680] PyGILState_Release does not release gil correctly, resulting in deadlock

[123 wlpha]

New submission from 123 wlpha <hackjajk at gmail.com>:

PyGILState_Release does not really release gil, causing the next PyGILState_Ensure deadlock, now you need to call if (PyGILState_Check () > 0) {PyEval_SaveThread ();}


```
auto gil = PyGILState_Ensure();

// call c api

PyGILState_Release (gil);
if (PyGILState_Check () ＞ 0) {
   PyEval_SaveThread ();
}
    
```

----------
components: Interpreter Core
messages: 355921
nosy: 123 wlpha
priority: normal
severity: normal
status: open
title: PyGILState_Release does not release gil correctly, resulting in deadlock
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38680>
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