Initial implementation of reaper thread.

Reaper thread destroys the socket asynchronously.
zmq_term() can be interrupted by a signal (EINTR).
zmq_socket() will return ETERM after zmq_term() was called.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

1 files changed, 139 insertions, 0 deletions

diff --git a/src/reaper.cpp b/src/reaper.cpp
new file mode 100644
index 0000000..f114f56
--- /dev/null
+++ b/src/reaper.cpp
@@ -0,0 +1,139 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 "reaper.hpp"
+#include "socket_base.hpp"
+#include "err.hpp"
+
+zmq::reaper_t::reaper_t (class ctx_t *ctx_, uint32_t tid_) :
+    object_t (ctx_, tid_),
+    terminating (false),
+    has_timer (false)
+{
+    poller = new (std::nothrow) poller_t;
+    zmq_assert (poller);
+
+    mailbox_handle = poller->add_fd (mailbox.get_fd (), this);
+    poller->set_pollin (mailbox_handle);
+}
+
+zmq::reaper_t::~reaper_t ()
+{
+    delete poller;
+}
+
+zmq::mailbox_t *zmq::reaper_t::get_mailbox ()
+{
+    return &mailbox;
+}
+
+void zmq::reaper_t::start ()
+{
+    //  Start the thread.
+    poller->start ();
+}
+
+void zmq::reaper_t::stop ()
+{
+    send_stop ();
+}
+
+void zmq::reaper_t::in_event ()
+{
+    while (true) {
+
+        //  Get the next command. If there is none, exit.
+        command_t cmd;
+        int rc = mailbox.recv (&cmd, false);
+        if (rc != 0 && errno == EINTR)
+            continue;
+        if (rc != 0 && errno == EAGAIN)
+            break;
+        errno_assert (rc == 0);
+
+        //  Process the command.
+        cmd.destination->process_command (cmd);
+    }
+}
+
+void zmq::reaper_t::out_event ()
+{
+    //  We are never polling for POLLOUT here. This function is never called.
+    zmq_assert (false);
+}
+
+void zmq::reaper_t::timer_event (int id_)
+{
+    zmq_assert (has_timer);
+    has_timer = false;
+    reap ();
+}
+
+void zmq::reaper_t::reap ()
+{
+    //  Try to reap each socket in the list.
+    for (sockets_t::iterator it = sockets.begin (); it != sockets.end ();) {
+        if ((*it)->reap ()) {
+
+            //  MSVC version of STL requires this to be done a spacial way...
+#if defined _MSC_VER
+            it = sockets.erase (it);
+#else
+            sockets.erase (it);
+#endif
+        }
+        else
+            ++it;
+    }
+
+    //  If there are still sockets to reap, wait a while, then try again.
+    if (!sockets.empty () && !has_timer) {
+        poller->add_timer (1 , this, 0);
+        has_timer = true;
+        return;
+    }
+
+    //  No more sockets and the context is already shutting down.
+    if (terminating) {
+        send_done ();
+        poller->rm_fd (mailbox_handle);
+        poller->stop ();
+        return;
+    }
+}
+
+void zmq::reaper_t::process_stop ()
+{
+    terminating = true;
+
+    if (sockets.empty ()) {
+        send_done ();
+        poller->rm_fd (mailbox_handle);
+        poller->stop ();
+    }
+}
+
+void zmq::reaper_t::process_reap (socket_base_t *socket_)
+{
+    //  Start termination of associated I/O object hierarchy.
+    socket_->terminate ();
+    sockets.push_back (socket_);
+    reap ();
+}
+