Problem with Threads in VisualGDB for Linux

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  • Author
    Posts
  • #25696
    hanooi
    Participant

    Hello,

    I’m getting the error of “undefined reference to ‘pthread_create'” when I try to build the following multithreading example from this site:

    https://www.geeksforgeeks.org/multithreading-in-cpp/

    The source example I’m trying to compile using the Raspberry Pi toolchain below.  What and where should I set the flags to enable me to link the <thread> library properly so the below would compile on my VisualGDB for the Raspberry?

    // CPP program to demonstrate multithreading
    // using three different callables.
    #include <iostream>
    #include <thread>
    using namespace std;

    // A dummy function
    void foo(int Z)
    {
    for (int i = 0; i < Z; i++) {
    cout << “Thread using function”
    ” pointer as callable\n”;
    }
    }

    // A callable object
    class thread_obj {
    public:
    void operator()(int x)
    {
    for (int i = 0; i < x; i++)
    cout << “Thread using function”
    ” object as callable\n”;
    }
    }
    ;

    int main()
    {
    cout << “Threads 1 and 2 and 3 ”
    “operating independently” << endl;

    // This thread is launched by using
    // function pointer as callable
    thread th1(foo, 3);

    // This thread is launched by using
    // function object as callable
    thread th2(thread_obj(), 3);

    // Define a Lambda Expression
    auto f = [](int x) {
    for (int i = 0; i < x; i++)
    cout << “Thread using lambda”
    ” expression as callable\n”;
    };

    // This thread is launched by using
    // lamda expression as callable
    thread th3(f, 3);

    // Wait for the threads to finish
    // Wait for thread t1 to finish
    th1.join();

    // Wait for thread t2 to finish
    th2.join();

    // Wait for thread t3 to finish
    th3.join();

    return 0;
    }

    • This topic was modified 5 years, 2 months ago by hanooi.
    #25698
    support
    Keymaster

    Please try adding “pthread” to the “library names” field on the Build Settings page of VisualGDB Project Properties. You can read more about various linker-related settings here: http://visualgdb.com/support/linkerinputs/

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