Merge commit 'e988fee1679536137b87d10e939eff5c1f27c8ab' as 'libs/libzmq'

libs/libzmq/src/mailbox.cpp

@@ -0,0 +1,106 @@
+/*
+    Copyright (c) 2007-2016 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/>.
+*/
+
+#include "precompiled.hpp"
+#include "mailbox.hpp"
+#include "err.hpp"
+
+zmq::mailbox_t::mailbox_t ()
+{
+    //  Get the pipe into passive state. That way, if the users starts by
+    //  polling on the associated file descriptor it will get woken up when
+    //  new command is posted.
+    const bool ok = _cpipe.check_read ();
+    zmq_assert (!ok);
+    _active = false;
+}
+
+zmq::mailbox_t::~mailbox_t ()
+{
+    //  TODO: Retrieve and deallocate commands inside the _cpipe.
+
+    // Work around problem that other threads might still be in our
+    // send() method, by waiting on the mutex before disappearing.
+    _sync.lock ();
+    _sync.unlock ();
+}
+
+zmq::fd_t zmq::mailbox_t::get_fd () const
+{
+    return _signaler.get_fd ();
+}
+
+void zmq::mailbox_t::send (const command_t &cmd_)
+{
+    _sync.lock ();
+    _cpipe.write (cmd_, false);
+    const bool ok = _cpipe.flush ();
+    _sync.unlock ();
+    if (!ok)
+        _signaler.send ();
+}
+
+int zmq::mailbox_t::recv (command_t *cmd_, int timeout_)
+{
+    //  Try to get the command straight away.
+    if (_active) {
+        if (_cpipe.read (cmd_))
+            return 0;
+
+        //  If there are no more commands available, switch into passive state.
+        _active = false;
+    }
+
+    //  Wait for signal from the command sender.
+    int rc = _signaler.wait (timeout_);
+    if (rc == -1) {
+        errno_assert (errno == EAGAIN || errno == EINTR);
+        return -1;
+    }
+
+    //  Receive the signal.
+    rc = _signaler.recv_failable ();
+    if (rc == -1) {
+        errno_assert (errno == EAGAIN);
+        return -1;
+    }
+
+    //  Switch into active state.
+    _active = true;
+
+    //  Get a command.
+    const bool ok = _cpipe.read (cmd_);
+    zmq_assert (ok);
+    return 0;
+}
+
+bool zmq::mailbox_t::valid () const
+{
+    return _signaler.valid ();
+}