Std::this_thread::sleep_for (3) Linux Manual Page

std::this_thread::sleep_for – std::this_thread::sleep_for

Synopsis

Defined in header<thread>

    template <class Rep, class Period>
    (since C++ 11)

        void sleep_for(const std::chrono::duration<Rep, Period> &sleep_duration);

Blocks the execution of the current thread for at least the specified sleep_duration.
This function may block for longer than sleep_duration due to scheduling or resource contention delays.
The standard recommends that a steady clock is used to measure the duration. If an implementation uses a system clock instead, the wait time may also be sensitive to clock adjustments.

Parameters

sleep_duration – time duration to sleep

Return value

(none)

Exceptions

Any exception thrown by clock, time_point, or duration during the execution (clocks, time points, and durations provided by the standard library never throw).

Example

// Run this code

#include <iostream>

#include <chrono>

#include <thread>
int main()

{
    using namespace std::chrono_literals;
    std::cout << "Hello waiter\n"
              << std::flush;
    auto start = std::chrono::high_resolution_clock::now();
    std::this_thread::sleep_for(2s);
    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double, std::milli> elapsed = end - start;
    std::cout << "Waited " << elapsed.count() << " ms\n";
}

Possible output:

Hello waiter
Waited 2000.12 ms

std::this_thread::sleep_for (3) Linux Manual Page