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diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/mailbox.hpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/mailbox.hpp
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+/*
+    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_MAILBOX_HPP_INCLUDED__
+#define __ZMQ_MAILBOX_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "platform.hpp"
+#include "signaler.hpp"
+#include "fd.hpp"
+#include "config.hpp"
+#include "command.hpp"
+#include "ypipe.hpp"
+#include "mutex.hpp"
+
+namespace zmq
+{
+
+    class mailbox_t
+    {
+    public:
+
+        mailbox_t ();
+        ~mailbox_t ();
+
+        fd_t get_fd () const;
+        void send (const command_t &cmd_);
+        int recv (command_t *cmd_, int timeout_);
+
+#ifdef HAVE_FORK
+        // close the file descriptors in the signaller. This is used in a forked
+        // child process to close the file descriptors so that they do not interfere
+        // with the context in the parent process.
+        void forked () { signaler.forked (); }
+#endif
+
+    private:
+
+        //  The pipe to store actual commands.
+        typedef ypipe_t <command_t, command_pipe_granularity> cpipe_t;
+        cpipe_t cpipe;
+
+        //  Signaler to pass signals from writer thread to reader thread.
+        signaler_t signaler;
+
+        //  There's only one thread receiving from the mailbox, but there
+        //  is arbitrary number of threads sending. Given that ypipe requires
+        //  synchronised access on both of its endpoints, we have to synchronise
+        //  the sending side.
+        mutex_t sync;
+
+        //  True if the underlying pipe is active, ie. when we are allowed to
+        //  read commands from it.
+        bool active;
+
+        //  Disable copying of mailbox_t object.
+        mailbox_t (const mailbox_t&);
+        const mailbox_t &operator = (const mailbox_t&);
+    };
+
+}
+
+#endif