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C++ Fundamentals for Professionals

Managing Thread Lifetime

Explore how to manage the lifetime of threads in C++ by using join and detach functions. Understand why not joining or detaching a thread causes exceptions and how to avoid them by properly synchronizing thread execution.

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The parent has to take care of its children - a simple principle that has significant consequences for the lifetime of a thread. This small program starts with a thread that displays its ID:

C++
// threadWithoutJoin.cpp
#include <iostream>
#include <thread>
int main(){
  std::thread t([]{std::cout << std::this_thread::get_id() << std::endl;});
}

But the program will not print the ID. What’s the reason for this exception? Let’s figure it out!

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