Use (cheaper) InterlockedCompareAndSet "native" method instead of AtomicReferenceFieldUpdater.

1 files changed, 4 insertions, 3 deletions

diff --git a/openjdk/java/lang/Thread.java b/openjdk/java/lang/Thread.java
index fefed5e3..1341a014 100644
--- a/openjdk/java/lang/Thread.java
+++ b/openjdk/java/lang/Thread.java
@@ -1747,10 +1747,11 @@ class Thread implements Runnable {
     // [IKVM] called by sun.misc.Launcher (via map.xml patch) to initialize the context class loader
     final void initContextClassLoader(ClassLoader cl) {
         // we only set contextClassLoader if it hasn't been set (by user code) previously
-        java.util.concurrent.atomic.AtomicReferenceFieldUpdater
-            .newUpdater(Thread.class, ClassLoader.class, "contextClassLoader")
-            .compareAndSet(this, ClassLoader.DUMMY, cl);
+        casContextClassLoader(ClassLoader.DUMMY, cl);
     }
+    
+    @ikvm.internal.InterlockedCompareAndSet("contextClassLoader")
+    private native boolean casContextClassLoader(ClassLoader oldValue, ClassLoader newValue);
 
     /**
      * Returns <tt>true</tt> if and only if the current thread holds the