initial commit

1 files changed, 31 insertions, 0 deletions

diff --git a/timer/SystemTimerResolution.java b/timer/SystemTimerResolution.java
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--- /dev/null
+++ b/timer/SystemTimerResolution.java
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+// ----------------------------------------------------------------------------
+/**
+ * A simple class to see what the Java system timer resolution is on your
+ * system.
+ * 
+ * @author (C) <a href="mailto:vroubtsov@illinoisalumni.org">Vlad Roubtsov</a>, 2002
+ */
+public class SystemTimerResolution
+{
+    // public: ................................................................
+    
+    public static void main (final String [] args)
+    {
+        // JIT/hotspot warmup:
+        for (int r = 0; r < 3000; ++ r) System.currentTimeMillis ();
+        
+        long time = System.currentTimeMillis (), time_prev = time;
+        
+        for (int i = 0; i < 5; ++ i)
+        {
+            // busy wait until system time changes: 
+            while (time == time_prev)
+                time = System.currentTimeMillis ();
+            
+            System.out.println ("delta = " + (time - time_prev) + " ms");
+            time_prev = time;
+        }
+    }
+
+} // end of class
+// ----------------------------------------------------------------------------