std::thread:: get_id

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

#include <chrono>
#include <iostream>
#include <thread>
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();
    std::cout << "t1's id after join: " << t1.get_id() << '\n';
    std::cout << "t2's id after join: " << t2.get_id() << '\n';
}

t1's id: 140146221688576
t2's id: 140146213295872
t1's id after join: thread::id of a non-executing thread
t2's id after join: thread::id of a non-executing thread

See also