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date: 2025-03-12 
time: 19:58:20
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# docstring
Add docstring in English to each classes and functions.

# swig 教學文
閱讀 https://www.swig.org/ 這個網站，寫一篇教學文，教導如何使用 swig 這個工具來將 C++ library 包裝成 Python library。
教學要從簡單到進階，每一階段都要給出範例與解說。

範例建立一個 C++ 的 class，分3階段將這個class複雜化，並用 swig 建立 Python library。
作業系統: Windows 11
編譯環境: Visual Studio 2022
Python 版本： 3.12

# Create global mutex
Use `ctypes` and Win32Api `CreateMutex` to create a global mutex here. Use class to wrap it.
This mutex shoid has these features:
1. When user instantiate this class, use Win32api `OpenMutex` to try to open this global mutex, because this mutex mybe alreday created in another process.
2. if `OpenMutex` failed, use `CreateMutex` to create the global mutex.
3. this class should provide lock and unlock function, use `WaitForSingleObject` and `ReleaseMutex` to implement it.
4. And, very important, class should has `release` function of mutex.


# 參考來源