std::thread::get_id

 

C++

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Technical Specifications

 

Thread support library

Threads
thread (C++11)
hardware_destructive_interference_sizehardware_constructive_interference_size (C++17)(C++17)
this_thread namespace
get_id (C++11) yield (C++11)	sleep_for (C++11) sleep_until (C++11)
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mutex (C++11) recursive_mutex (C++11) shared_mutex (C++17)	timed_mutex (C++11) recursive_timed_mutex (C++11) shared_timed_mutex (C++14)
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lock_guard (C++11) unique_lock (C++11) shared_lock (C++14) defer_lock_ttry_to_lock_tadopt_lock_t (C++11)(C++11)(C++11)	lock (C++11) try_lock (C++11) defer_locktry_to_lockadopt_lock (C++11)(C++11)(C++11) once_flag (C++11) call_once (C++11)
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std::thread

Member classes

thread::id

Member functions

thread::thread

thread::~thread

thread::operator=

Observers

thread::joinable

thread::get_id

thread::native_handle

thread::hardware_concurrency

Operations

thread::join

thread::detach

thread::swap

Non-member functions

std::swap

 

std::thread::id get_id() const;		(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.

Exceptions

noexcept specification:  

noexcept

  

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

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