Com port access in two threads..

This is a discussion on Com port access in two threads.. within the C Programming forums, part of the General Programming Boards category; I am developing a serial communication utility in VC++, which is Windows console application. I am creating a communication port ...

  1. #1
    Registered User
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    Feb 2003
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    Com port access in two threads..

    I am developing a serial communication utility in VC++, which is Windows console application.

    I am creating a communication port in main thread. And I use com port handle in main thread and in another thread spawned by main thread.

    Do I really need to synchronise com port access in both threads by mutex? What is side effect, if I do not synchronise com port access, in thread spanwned by main thread?

    Please let me know.

  2. #2
    Guest Sebastiani's Avatar
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    Well obviously if one thread is writing to the port and suddenly the second begins writing too for instance...you have a problem.
    In cases like this, sinchronization is not just an option - it's mandatory! You might check out 'Multithreading Applications in Win32' by Beveridge and Weiner.
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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