changed the shared_ptr_thread_safe object so that it unlocks its

internal mutex before calling delete on the pointer that it contains.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402565

dlib/smart_pointers/shared_ptr_thread_safe.h

@@ -152,13 +152,15 @@ namespace dlib
                     if (shared_node->del)
                     {
                         shared_node->del->del(data);
+                        
+                        shared_node->m.unlock();
                         delete shared_node->del;
                     }
                     else
                     {
+                        shared_node->m.unlock();
                         delete data;
                     }
-                    shared_node->m.unlock();
 
                     // finally delete the shared_node
                     delete shared_node;