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std::ofstream threadsafe?

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There are many ways a program can be thread safe, what do you mean exactly?
IIRC ostream is usually not thread safe, i.e.:

// thread a
stream << "test";
// thread b
stream << "test";

might output "tteesstt".

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Wrap the part of your logger that writes to the file in a mutex. It shouldn't be much effort, just 4 calls (InitializeCriticalSection(), DeleteCriticalSection(), EnterCriticalSection(), LeaveCriticalSection())

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