diff -urN toto/boost_1_32_0/libs/signals/src/connection.cpp boost_1_32_0/libs/signals/src/connection.cpp
--- toto/boost_1_32_0/libs/signals/src/connection.cpp	2004-07-24 22:59:30.000000000 -0400
+++ boost_1_32_0/libs/signals/src/connection.cpp	2005-02-10 10:28:44.851254504 -0500
@@ -28,6 +28,23 @@
     }
 
     void
+    connection::block() 
+    {
+      con->blocked = true ;
+    }
+
+    void
+    connection::unblock() 
+    {
+      con->blocked = false ;
+    }
+
+    bool 
+    connection::is_blocked() const {
+      return con->blocked ;
+    }
+
+    void
     connection::reset(BOOST_SIGNALS_NAMESPACE::detail::basic_connection* new_con)
     {
       con.reset(new_con);
diff -urN toto/boost_1_32_0/libs/signals/src/slot.cpp boost_1_32_0/libs/signals/src/slot.cpp
--- toto/boost_1_32_0/libs/signals/src/slot.cpp	2004-10-29 08:44:13.000000000 -0400
+++ boost_1_32_0/libs/signals/src/slot.cpp	2005-02-10 10:26:51.486488568 -0500
@@ -24,6 +24,7 @@
           // signal for the connection to be connected.
           con->signal = static_cast<void*>(this);
           con->signal_data = 0;
+	  con->blocked = false ;
           con->signal_disconnect = &bound_object_destructed;
         }