From 19059fb1cd9df7b23e4920d27cbc910f1045211a Mon Sep 17 00:00:00 2001
From: Oliver Kowalke <oliver.kowalke@gmx.de>
Date: Sun, 29 Dec 2013 11:34:24 +0100
Subject: [PATCH] ioptimize test for fiber in spinlock

---
 src/detail/spinlock.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/detail/spinlock.cpp b/src/detail/spinlock.cpp
index 38b4a8d7..38ebd7b3 100644
--- a/src/detail/spinlock.cpp
+++ b/src/detail/spinlock.cpp
@@ -22,6 +22,7 @@ spinlock::spinlock() :
 void
 spinlock::lock()
 {
+    bool is_fiber = 0 != scheduler::instance()->active().get();
     for (;;)
     {
         // access to CPU's cache
@@ -30,7 +31,7 @@ spinlock::lock()
         while ( LOCKED == state_)
         {
             // busy-wait
-            if ( scheduler::instance()->active() )
+            if ( is_fiber)
                 scheduler::instance()->yield();
             else
                 this_thread::yield();