Index: fifo_worker.hpp
===================================================================
--- fifo_worker.hpp	(revision 2)
+++ fifo_worker.hpp	(working copy)
@@ -34,6 +34,7 @@
 #  endif
 
 #  include <boost/thread/mutex.hpp>
+#  include <boost/thread/lock_types.hpp>
 #  include <boost/thread/condition.hpp>
 
 #  ifdef BOOST_MSVC
@@ -80,7 +81,7 @@
       }
 
       #ifdef BOOST_HAS_THREADS
-      mutex::scoped_lock lock( mutex_ );
+      boost::unique_lock<boost::mutex> lock( mutex_ );
       #endif
 
       workQueue_.push_back( work_item() );
@@ -143,7 +144,7 @@
     work_item dequeue_item()
     {
       #ifdef BOOST_HAS_THREADS
-      mutex::scoped_lock lock( mutex_ );
+      boost::unique_lock<boost::mutex> lock( mutex_ );
 
       if ( !waitOnEmptyQueue_ && workQueue_.empty() )
       {