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Asked: 2026-05-23T03:27:23+00:00

I know that that question may be seemed as a duplicate, but I haven’t

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I know that that question may be seemed as a duplicate, but I haven’t got the answer reading the other questions.

My situation – Visual C++ compiler 2005 from express edition studio + Windows sdk.

Just a question if a function like that:

void myFunc()
{
    int i=0;
    i++;
}

is safe to call from multiple threads?

Yes, it seems like it is, but won’t the compiler make the i variable be static in the memory? So that could lead to that two threads are acting together on one memory region? Or my fears are just some fears of a fool? And all local variables are created in the moment of calling the function?

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1 Answer

  1. Editorial Team

    Yes, it is thread safe.

    i will not be static in memory, because it is not static. If, on the other hand, you had written:

    void myFunc()
{
    static int i = 0;
    i++;
}

    Then it would not be thread safe (well, if i was actually used).

    Local variables are all located on the stack (or live entirely in registers). Each thread has its own stack, and registers are handled in such a way that they are essentially local to each thread (see Context Switching), so you are fine.

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