C++ std::thread: Join vs Detach

What is the difference between join and detach in C++ threads?

In C++, join and detach are two methods used to manage threads. join waits for a thread to finish its execution, while detach allows the thread to run independently.

When should I use join instead of detach?

You should use join when you need to ensure that a thread has completed its task before proceeding, especially if you need the result of that thread.

Can you give an example of using join and detach?

Sure! Here's a simple example:

#include <iostream>
#include <thread>

void task() {
    std::cout << "Task is running!" << std::endl;
}

int main() {
    std::thread t(task);
    t.join(); // Waits for the task to finish
    // t.detach(); // Would allow the task to run independently
    return 0;
}

What happens if I forget to join or detach a thread?

If you forget to join or detach a thread, it will lead to a program termination error. The thread will be considered a 'joinable' thread, and the program will not exit until it is joined or detached.