确保准则3得到满足，要求编译器预先知道所有可重入函数，包括应用程序所使用的程序库。

Ensuring guideline 3 requires the compiler to have prior knowledge of all the reentrant functions, including the libraries used by the application.

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理解这五条最好的经验将帮助您保持程序的可重入性。

Sticking to these five best practices will help you maintain reentrancy in your programs.

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近来很多提供商已经开始提供标准c程序库的可重入版本，这是一个好消息。

The good news is, these days many vendors have taken the initiative to provide reentrant versions of the standard C library.

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