From 9f14ad29bf2d652c11328479ccb11030408c0543 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Tue, 8 Nov 2011 04:52:40 +0100
Subject: Platform: Add 'getCurrentSleepJitter()'

---
 src/java/com/jogamp/common/os/Platform.java | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'src/java/com')

diff --git a/src/java/com/jogamp/common/os/Platform.java b/src/java/com/jogamp/common/os/Platform.java
index 27d556c..2c1a18e 100644
--- a/src/java/com/jogamp/common/os/Platform.java
+++ b/src/java/com/jogamp/common/os/Platform.java
@@ -35,6 +35,7 @@ import java.nio.IntBuffer;
 import java.nio.ShortBuffer;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
+import java.util.concurrent.TimeUnit;
 import java.util.jar.JarFile;
 
 import com.jogamp.common.nio.Buffers;
@@ -560,6 +561,30 @@ public class Platform {
      */
     public static MachineDescription getMachineDescription() {
         return machineDescription;
-    }    
+    }
+    
+    //
+    // time / jitter
+    //
+
+    /**
+     * Returns the estimated sleep jitter value in nanoseconds.
+     * <p>
+     * Includes a warm-up path, allowing hotspot to optimize the code.
+     * </p>
+     */
+    public static synchronized long getCurrentSleepJitter() {
+        getCurrentSleepJitterImpl(TimeUnit.MILLISECONDS.toNanos(10), 10); // warm-up
+        return getCurrentSleepJitterImpl(TimeUnit.MILLISECONDS.toNanos(10), 10);
+    }  
+    private static long getCurrentSleepJitterImpl(final long nsDuration, final int splitInLoops) {
+        final long nsPeriod = nsDuration / splitInLoops;
+        final long t0_ns = System.nanoTime();
+        for(int i=splitInLoops; i>0; i--) {
+            try { TimeUnit.NANOSECONDS.sleep(nsPeriod); } catch (InterruptedException e) { }
+        }
+        return  ( ( System.nanoTime() - t0_ns ) - nsDuration ) / splitInLoops;
+    }
+
 }
 
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