윤묵이형이 정리한 것

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http://www.unet.univie.ac.at/aix/aixprggd/genprogc/writing_reentrant_thread_safe_code.htm

위의 URL에 가시면 설명이 되어 있습니다. 둘 간의 관계는 “it may be impossible to make a non-reentrant function thread-safe.” 로 설명이 될 것 같네요.

인용해서 요약하면

Reentrance A reentrant function does not hold static data over successive calls, nor does it return a pointer to static data. All data is provided by the caller of the function. A reentrant function must not call non-reentrant functions.

Thread-Safety A thread-safe function protects shared resources from concurrent access by locks. Thread-safety concerns only the implementation of a function and does not affect its external interface.