C++ Operations on the current thread


Example

std::this_thread is a namespace which has functions to do interesting things on the current thread from function it is called from.

FunctionDescription
get_idReturns the id of the thread
sleep_forSleeps for a specified amount of time
sleep_untilSleeps until a specific time
yieldReschedule running threads, giving other threads priority

Getting the current threads id using std::this_thread::get_id:

void foo()
{
    //Print this threads id
    std::cout << std::this_thread::get_id() << '\n';
}

std::thread thread{ foo };
thread.join(); //'threads' id has now been printed, should be something like 12556

foo(); //The id of the main thread is printed, should be something like 2420

Sleeping for 3 seconds using std::this_thread::sleep_for:

void foo()
{
    std::this_thread::sleep_for(std::chrono::seconds(3));
}

std::thread thread{ foo };
foo.join();

std::cout << "Waited for 3 seconds!\n";

Sleeping until 3 hours in the future using std::this_thread::sleep_until:

void foo()
{
    std::this_thread::sleep_until(std::chrono::system_clock::now() + std::chrono::hours(3));
}

std::thread thread{ foo };
thread.join();

std::cout << "We are now located 3 hours after the thread has been called\n";

Letting other threads take priority using std::this_thread::yield:

void foo(int a)
{
    for (int i = 0; i < al ++i)
        std::this_thread::yield(); //Now other threads take priority, because this thread
                                   //isn't doing anything important

    std::cout << "Hello World!\n";
}

std::thread thread{ foo, 10 };
thread.join();