创建一个线程作为类数据成员

Question

I am trying to create a thread and keep the reference to it as a memeber of the class, and the thread calls a method of the class. Here is the code:

EventQueue::EventQueue() {

    this->dispatcherThread = std::thread(&EventQueue::dispatchEvent, std::ref(*this));
    this->dispatcherThread.join();

}

I am using QtCreator to do the build. And gets this error:

/home/eventqueue.o:-1: In function std::thread::thread<void (EventQueue::*)(), std::reference_wrapper<EventQueue> >(void (EventQueue::*&&)(), std::reference_wrapper<EventQueue>&&)': /usr/include/c++/4.9/thread:136: error: undefined reference to pthread_create' :-1: error: collect2: error: ld returned 1 exit status

What is the problem?

I was referencing to this post: Storing an std::thread object as a class member

However I always get the compilation error described above

Answer 1

You need to link against the pthread library.

With GCC, we do this with the -pthread option.

For example: g++ -pthread ...