#include "Timer.hh"

#include <chrono>

#include <thread>

namespace openmsx::Timer {

uint64_t getTime()

{

	static uint64_t lastTime = 0;

	using namespace std::chrono;

	uint64_t now = duration_cast<microseconds>(

		steady_clock::now().time_since_epoch()).count();

	// Other parts of openMSX may crash if this function ever returns a

	// value that is less than a previously returned value. Hence this

	// extra check.

	// Steady_clock _should_ be monotonic. It's implemented in terms of

	// clock_gettime(CLOCK_MONOTONIC). Unfortunately in older linux

	// versions we've seen buggy implementation that once in a while did

	// return time points slightly in the past.

	if (now < lastTime) return lastTime;

	lastTime = now;

	return now;

}

void sleep(uint64_t us)

{

	std::this_thread::sleep_for(std::chrono::microseconds(us));

}

} // namespace openmsx::Timer