std::thread::swap (3) - Linux Manuals

std::thread::swap: std::thread::swap

NAME

std::thread::swap - std::thread::swap

Synopsis

void swap( thread& other ) noexcept; (since C++11)

Exchanges the underlying handles of two thread objects.

Parameters

other - the thread to swap with

Return value

(none)

Example

// Run this code

  #include <iostream>
  #include <thread>
  #include <chrono>

  void foo()
  {
      std::this_thread::sleep_for(std::chrono::seconds(1));
  }

  void bar()
  {
      std::this_thread::sleep_for(std::chrono::seconds(1));
  }

  int main()
  {
      std::thread t1(foo);
      std::thread t2(bar);

      std::cout << "thread 1 id: " << t1.get_id() << std::endl;
      std::cout << "thread 2 id: " << t2.get_id() << std::endl;

      std::swap(t1, t2);

      std::cout << "after std::swap(t1, t2):" << std::endl;
      std::cout << "thread 1 id: " << t1.get_id() << std::endl;
      std::cout << "thread 2 id: " << t2.get_id() << std::endl;

      t1.swap(t2);

      std::cout << "after t1.swap(t2):" << std::endl;
      std::cout << "thread 1 id: " << t1.get_id() << std::endl;
      std::cout << "thread 2 id: " << t2.get_id() << std::endl;

      t1.join();
      t2.join();
  }

Possible output:

  thread 1 id: 1892
  thread 2 id: 2584
  after std::swap(t1, t2):
  thread 1 id: 2584
  thread 2 id: 1892
  after t1.swap(t2):
  thread 1 id: 1892
  thread 2 id: 2584