Is it thread safe for strcmp?

Question

strcmp(variable, "constant");

Or do I need to protect it with a mutex?

Answer 1

If a variable can be modified by another thread, you must protect it. No magic here - higher-level languages ​​can perform such a function call atomically, and this is “magic” not present in C.

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Answer 2

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Answer 3

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Answer 4

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Answer 5

Have a look here: http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_09.html

POSIX has a list of unsafe functions. Accordingly, at least on POSIX it strcmp()will be thread safe.