From 39d0adc13b5c82193199c2f0c5445aa3feaa60eb Mon Sep 17 00:00:00 2001
From: Egor Yusov <egor.yusov@gmail.com>
Date: Mon, 27 Aug 2018 22:55:19 -0700
Subject: Updated LockHelper to spin few times before yielding thread

---
 Common/interface/LockHelper.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'Common/interface')

diff --git a/Common/interface/LockHelper.h b/Common/interface/LockHelper.h
index 0605bfb5..8d30089d 100644
--- a/Common/interface/LockHelper.h
+++ b/Common/interface/LockHelper.h
@@ -96,11 +96,19 @@ public:
             return false;
     }
     
+    static constexpr const int SpinCountToYield = 256;
+
     static void UnsafeLock(LockFlag &LockFlag)
     {
+        int SpinCount = 0;
         while( !UnsafeTryLock( LockFlag ) )
         {
-            YieldThread();
+            ++SpinCount;
+            if(SpinCount == SpinCountToYield)
+            {
+                SpinCount = 0;
+                YieldThread();
+            }
         }
     }
 
@@ -108,9 +116,15 @@ public:
     {
         VERIFY( m_pLockFlag == NULL, "Object already locked" );
         // Wait for the flag to become unlocked and lock it
+        int SpinCount = 0;
         while( !TryLock( LockFlag ) )
         {
-            YieldThread();
+            ++SpinCount;
+            if(SpinCount == SpinCountToYield)
+            {
+                SpinCount = 0;
+                YieldThread();
+            }
         }
     }
 
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