std::thread::get_id (3) Linux Manual Page

std::thread::get_id – std::thread::get_id

Synopsis

std::thread::id get_id() const noexcept; (since C++11)
Returns a value of std::thread::id identifying the thread associated with *this.

Parameters

(none)

Return value

A value of type std::thread::id identifying the thread associated with *this. If there is no thread associated, default constructed std::thread::id is returned.

Example

// Run this code

#include <iostream>

#include <thread>

#include <chrono>
void foo()

{
    std::this_thread::sleep_for(std::chrono::seconds(1));
}
int main()

{
    std::thread t1(foo);
    std::thread::id t1_id = t1.get_id();
    std::thread t2(foo);
    std::thread::id t2_id = t2.get_id();
    std::cout << "t1's id: " << t1_id << '\n';
    std::cout << "t2's id: " << t2_id << '\n';
    t1.join();
    t2.join();
}

Possible output:

  t1’s id: 0x35a7210f
  t2’s id: 0x35a311c4

See also

         represents the id of a thread
id (public member class)
         checks whether the thread is joinable, i.e. potentially running in parallel context
joinable (public member function)