diff --git a/shared_ptr_mt_test.cpp b/shared_ptr_mt_test.cpp
index 831be86..489aa7c 100644
--- a/shared_ptr_mt_test.cpp
+++ b/shared_ptr_mt_test.cpp
@@ -84,7 +84,7 @@ char const * title = "Using POSIX threads";
 
 #include <pthread.h>
 
-extern "C" void* common_thread_routine(void * pv)
+extern "C" void * common_thread_routine(void * pv)
 {
     abstract_thread * pt = static_cast<abstract_thread *>(pv);
     pt->run();
@@ -145,9 +145,17 @@ void test(boost::shared_ptr<int> const & pi)
 
 int const m = 16; // threads
 
+#if defined(BOOST_LWM_USE_CRITICAL_SECTION)
+    char const * implementation = "critical section";
+#elif defined(BOOST_LWM_USE_PTHREADS)
+    char const * implementation = "pthread_mutex";
+#else
+    char const * implementation = "spinlock";
+#endif
+
 int test_main( int, char ** )
 {
-    std::printf("%s: %d threads, %d iterations, ", title, m, n);
+    std::printf("%s: %s, %d threads, %d iterations: ", title, implementation, m, n);
 
     boost::shared_ptr<int> pi(new int(42));
 
@@ -167,7 +175,7 @@ int test_main( int, char ** )
 
     t = std::clock() - t;
 
-    std::printf("%.4f seconds.\n", static_cast<double>(t) / CLOCKS_PER_SEC);
+    std::printf("\n\n%.3f seconds.\n", static_cast<double>(t) / CLOCKS_PER_SEC);
 
     return 0;
 }