Problem: modifying pipe from different thread is not safe

Solution: revert change from #2299 to avoid bugs while we look for an
alternative and thread-safe solution

src/pipe.cpp

@@ -522,11 +522,6 @@ void zmq::pipe_t::set_hwms (int inhwm_, int outhwm_)
     hwm = out;
 }
 
-void zmq::pipe_t::set_peer_hwms (int inhwm_, int outhwm_)
-{
-    peer->set_hwms(inhwm_, outhwm_);
-}
-
 void zmq::pipe_t::set_hwms_boost(int inhwmboost_, int outhwmboost_)
 {
     inhwmboost = inhwmboost_;

src/pipe.hpp

@@ -133,9 +133,6 @@ namespace zmq
         //  Set the high water marks.
         void set_hwms (int inhwm_, int outhwm_);
 
-        //  Set the high water marks for peer.
-        void set_peer_hwms (int inhwm_, int outhwm_);
-
         //  Set the boost to high water marks, used by inproc sockets so total hwm are sum of connect and bind sockets watermarks
         void set_hwms_boost(int inhwmboost_, int outhwmboost_);
 

src/socket_base.cpp

@@ -1414,7 +1414,6 @@ void zmq::socket_base_t::update_pipe_options(int option_)
         for (pipes_t::size_type i = 0; i != pipes.size(); ++i)
         {
             pipes[i]->set_hwms(options.rcvhwm, options.sndhwm);
-            pipes[i]->set_peer_hwms(options.sndhwm, options.rcvhwm);
         }
     }