am 3d79f1ce: am edc68a00: Merge "Attempt to reduce problems from issue #3183612" into gingerbread

* commit '3d79f1ce84ee60dbb26468b9e5f75f4ccb5ed8aa':
  Attempt to reduce problems from issue #3183612

core/java/android/os/Looper.java

@@ -112,6 +112,12 @@ public class Looper {
             throw new RuntimeException("No Looper; Looper.prepare() wasn't called on this thread.");
         }
         MessageQueue queue = me.mQueue;
+        
+        // Make sure the identity of this thread is that of the local process,
+        // and keep track of what that identity token actually is.
+        Binder.clearCallingIdentity();
+        final long ident = Binder.clearCallingIdentity();
+        
         while (true) {
             Message msg = queue.next(); // might block
             if (msg != null) {
@@ -127,6 +133,17 @@ public class Looper {
                 if (me.mLogging != null) me.mLogging.println(
                         "<<<<< Finished to    " + msg.target + " "
                         + msg.callback);
+                
+                // Make sure that during the course of dispatching the
+                // identity of the thread wasn't corrupted.
+                final long newIdent = Binder.clearCallingIdentity();
+                if (ident != newIdent) {
+                    Log.wtf("Looper", "Thread identity changed from 0x"
+                            + Long.toHexString(ident) + " to 0x"
+                            + Long.toHexString(newIdent) + " while dispatching to "
+                            + msg.target + " " + msg.callback + " what=" + msg.what);
+                }
+                
                 msg.recycle();
             }
         }