Fix a number of whitespace issues in various parts of the code, add validation to most calls on the test and take a first stab at implementing the reconnection pipe blocking.

It didn't seem straightforward to use any of the existing process calls, so I have added a new command to command_t and friends called detach. This instructs the socket_base to remove the pipe from it's pipe list. The session base stores a copy of the outpipe, and will resend the bind command on reconnection. This should allow balancing again.

src/socket_base.cpp

@@ -529,13 +529,13 @@ int zmq::socket_base_t::connect (const char *addr_)
     session_base_t *session = session_base_t::create (io_thread, true, this,
         options, paddr);
     errno_assert (session);
-    
+
     //  PGM does not support subscription forwarding; ask for all data to be
     //  sent to this pipe.
     bool icanhasall = false;
     if (protocol == "pgm" || protocol == "epgm")
         icanhasall = true;
-    
+
     if (options.delay_attach_on_connect != 1 && icanhasall != true) {
         //  Create a bi-directional pipe.
         object_t *parents [2] = {this, session};
@@ -547,7 +547,7 @@ int zmq::socket_base_t::connect (const char *addr_)
 
         //  Attach local end of the pipe to the socket object.
         attach_pipe (pipes [0], icanhasall);
-        
+
         //  Attach remote end of the pipe to the session object later on.
         session->attach_pipe (pipes [1]);
     }
@@ -876,6 +876,17 @@ void zmq::socket_base_t::process_destroy ()
     destroyed = true;
 }
 
+void zmq::socket_base_t::process_detach (pipe_t *pipe_)
+{
+    //  If we are blocking connecting threads, drop this one
+    if (options.delay_attach_on_connect == 1) {
+        zmq_assert (pipe_);
+        pipes.erase (pipe_);
+        //  Let derived sockets know we're ditching this pipe
+        xterminated (pipe_);
+    }
+}
+
 int zmq::socket_base_t::xsetsockopt (int option_, const void *optval_,
     size_t optvallen_)
 {