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The current time must be stored globally in order for gettimeofday to work, however I am not sure if the function modifies any global state so that concurrent execution is undefined.
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The POSIX spec says time is required to be thread safe, and so it is.
Functions named functionA() are never thread-safe.
Thread safety is a computer programming concept applicable to multi-threaded code. Thread-safe code only manipulates shared data structures in a manner that ensures that all threads behave properly and fulfill their design specifications without unintended interaction.
Sockets are not part of C++ Standard so it depends on implementation. Generally they are not thread safe since send is not an atomic operation.
gettimeofday is thread safe.
The (posix) functions listed here might not be, gettimeofday is not one of them.
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