Moved testCancel() to end of loop as per TXP pager code.

src/osgDB/DatabasePager.cpp

@@ -195,12 +195,9 @@ void DatabasePager::run()
     // by keeping deleted texture objects around for 10 seconds after being deleted.
     osg::Texture::getTextureObjectManager()->setExpiryDelay(10.0f);
     
-    while(true)
+    do
     {
     
-        // test to see if we need to exit.
-        testCancel();
-    
         //
         // delete any children if required.
         //
@@ -296,7 +293,7 @@ void DatabasePager::run()
         // go to sleep till our the next time our thread gets scheduled.
         YieldCurrentThread();
 
-    }
+    } while (!testCancel());
     
     cancel();
     join();