posix: add missing delay_us and delay_ms functions

#include "arch.h"

#include <time.h>

#include <unistd.h>

#if defined(WITH_LOOP) || defined(TIMER_S)

{

}

void Arch::delay_us(unsigned int const us)

{

	struct timespec ts;

	ts.tv_sec = 0;

	ts.tv_nsec = us * 1000;

	nanosleep(&ts, NULL);

}

void Arch::delay_ms(unsigned int const ms)

{

	struct timespec ts;

	ts.tv_sec = ms / 1000;

	ts.tv_nsec = (ms % 1000) * 1000000;

	nanosleep(&ts, NULL);

}

Arch arch;