Making a program sleep for milliseconds?

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I've been usin POSIX sleep(x) function to make my program sleep for x seconds. But I need to make it sleep for x milliseconds in C++? Any way I can do this?
Mar 1 in Linux Administration by Damon Salvatore
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There are no standard C API's that can make your program sleep in milliseconds. so you will have to use usleep(on unix systems) which accepts microseconds:

#include <unistd.h>

unsigned int microseconds;
...
usleep(microseconds);
answered Mar 1 by DareDev
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