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What constitutes a data race in C++?

A Two threads accessing the same memory concurrently where at least one writes, without synchronisation
B Any use of two threads
C Two threads reading the same variable
D Threads finishing at different times

Answer

Two threads accessing the same memory concurrently where at least one writes, without synchronisation

A data race is undefined behaviour, not merely a wrong value, so the compiler may optimise on the assumption it cannot occur.

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