How do you add a timed delay to a C++ program?

Question

I am trying to add a timed delay in a C++ program, and was wondering if anyone has any suggestions on what I can try or information I can look at?

I wish I had more details on how I am implementing this timed delay, but until I have more information on how to add a timed delay I am not sure on how I should even attempt to implement this.

Answer 1

An updated answer for C++11:

Use the sleep_for and sleep_until functions:

#include <chrono> #include <thread>  int main() {     using namespace std::this_thread; // sleep_for, sleep_until     using namespace std::chrono; // nanoseconds, system_clock, seconds      sleep_for(nanoseconds(10));     sleep_until(system_clock::now() + seconds(1)); } 

With these functions there's no longer a need to continually add new functions for better resolution: sleep, usleep, nanosleep, etc. sleep_for and sleep_until are template functions that can accept values of any resolution via chrono types; hours, seconds, femtoseconds, etc.

In C++14 you can further simplify the code with the literal suffixes for nanoseconds and seconds:

#include <chrono> #include <thread>  int main() {     using namespace std::this_thread;     // sleep_for, sleep_until     using namespace std::chrono_literals; // ns, us, ms, s, h, etc.     using std::chrono::system_clock;      sleep_for(10ns);     sleep_until(system_clock::now() + 1s); } 

Note that the actual duration of a sleep depends on the implementation: You can ask to sleep for 10 nanoseconds, but an implementation might end up sleeping for a millisecond instead, if that's the shortest it can do.