How to sleep for few milliseconds in swift 2.2?

Question

please anyone tell me how to use sleep() for few milliseconds in swift 2.2?

while (true){     print("sleep for 0.002 seconds.")     sleep(0.002) // not working } 

but

while (true){     print("sleep for 2 seconds.")     sleep(2) // working } 

it is working.

Answer 1

usleep() takes millionths of a second

usleep(1000000) //will sleep for 1 second usleep(2000) //will sleep for .002 seconds 

OR

 let ms = 1000  usleep(useconds_t(2 * ms)) //will sleep for 2 milliseconds (.002 seconds) 

OR

let second: Double = 1000000 usleep(useconds_t(0.002 * second)) //will sleep for 2 milliseconds (.002 seconds)