Measuring time in smaller unit than millisecond

Question

I need to be able to measure time to a higher precision than Java provides. Is there any way that I can achieve this using a windows platform preferably?

Answer 1

Here is the code JNI C code:
JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceFrequency (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lFrequency;
     ::QueryPerformanceFrequency(&lFrequency);
     return (jdouble)lFrequency.QuadPart;
JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceCounter (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lpCounter;
     ::QueryPerformanceCounter(&lpCounter);
     return (jdouble)lpCounter.QuadPart;
}Here is the java code:
import javax.swing.JOptionPane;
import javax.swing.*;
import java.net.*;
import java.awt.*;
public class Win32Native {
   public native double queryPerformanceFrequency();
   public native double queryPerformanceCounter();
   static {
         System.out.println("Loading library...");
         System.loadLibrary("Win32Native");
         System.out.println("Loaded ok!");
   public static void main(String[] args)  {
      Win32Native nat = new Win32Native();
      // You can call functions here as a quick test
      System.exit(0);
}