From 4338f4e1d7c841ba447eb2d7481daaa009182bc7 Mon Sep 17 00:00:00 2001
From: Teravus Ovares (Dan Olivares)
Date: Sun, 29 Nov 2009 05:06:25 -0500
Subject: * Patch from Misterblue to fix Environment.TickCount for statistics
 purposes.    Resolves the wrap-around of the 32 bit uint. * Teravus moved the
 Environment methods to the Util class

---
 OpenSim/Framework/Util.cs | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'OpenSim/Framework')

diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 87ba5a8..a459f8d 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -1389,6 +1389,30 @@ namespace OpenSim.Framework
             return null;
         }
 
-        #endregion FireAndForget Threading Pattern
+        #endregion FireAndForget Threading Pattern
+        /// <summary>
+        /// Environment.TickCount is an int but it counts all 32 bits so it goes positive
+        /// and negative every 24.9 days. This trims down TickCount so it doesn't wrap
+        /// for the callers. 
+        /// This trims it to a 12 day interval so don't let your frame time get too long.
+        /// </summary>
+        /// <returns></returns>
+        public static Int32 EnvironmentTickCount()
+        {
+            return Environment.TickCount & EnvironmentTickCountMask;
+        }
+        const Int32 EnvironmentTickCountMask = 0x3fffffff;
+
+        /// <summary>
+        /// Environment.TickCount is an int but it counts all 32 bits so it goes positive
+        /// and negative every 24.9 days. Subtracts the passed value (previously fetched by
+        /// 'EnvironmentTickCount()') and accounts for any wrapping.
+        /// </summary>
+        /// <returns>subtraction of passed prevValue from current Environment.TickCount</returns>
+        public static Int32 EnvironmentTickCountSubtract(Int32 prevValue)
+        {
+            Int32 diff = EnvironmentTickCount() - prevValue;
+            return (diff >= 0) ? diff : (diff + EnvironmentTickCountMask + 1);
+        }
     }
 }
-- 
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