Merge commit 'e988fee1679536137b87d10e939eff5c1f27c8ab' as 'libs/libzmq'

libs/libzmq/src/poller_base.cpp

@@ -0,0 +1,147 @@
+/*
+    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 "poller_base.hpp"
+#include "i_poll_events.hpp"
+#include "err.hpp"
+
+zmq::poller_base_t::~poller_base_t ()
+{
+    //  Make sure there is no more load on the shutdown.
+    zmq_assert (get_load () == 0);
+}
+
+int zmq::poller_base_t::get_load () const
+{
+    return _load.get ();
+}
+
+void zmq::poller_base_t::adjust_load (int amount_)
+{
+    if (amount_ > 0)
+        _load.add (amount_);
+    else if (amount_ < 0)
+        _load.sub (-amount_);
+}
+
+void zmq::poller_base_t::add_timer (int timeout_, i_poll_events *sink_, int id_)
+{
+    uint64_t expiration = _clock.now_ms () + timeout_;
+    timer_info_t info = {sink_, id_};
+    _timers.insert (timers_t::value_type (expiration, info));
+}
+
+void zmq::poller_base_t::cancel_timer (i_poll_events *sink_, int id_)
+{
+    //  Complexity of this operation is O(n). We assume it is rarely used.
+    for (timers_t::iterator it = _timers.begin (), end = _timers.end ();
+         it != end; ++it)
+        if (it->second.sink == sink_ && it->second.id == id_) {
+            _timers.erase (it);
+            return;
+        }
+
+    //  We should generally never get here. Calling 'cancel_timer ()' on
+    //  an already expired or canceled timer (or even worse - on a timer which
+    //  never existed, supplying bad sink_ and/or id_ values) does not make any
+    //  sense.
+    //  But in some edge cases this might happen. As described in issue #3645
+    //  `timer_event ()` call from `execute_timers ()` might call `cancel_timer ()`
+    //  on already canceled (deleted) timer.
+    //  As soon as that is resolved an 'assert (false)' should be put here.
+}
+
+uint64_t zmq::poller_base_t::execute_timers ()
+{
+    //  Fast track.
+    if (_timers.empty ())
+        return 0;
+
+    //  Get the current time.
+    const uint64_t current = _clock.now_ms ();
+
+    //  Execute the timers that are already due.
+    uint64_t res = 0;
+    timer_info_t timer_temp;
+    timers_t::iterator it;
+
+    do {
+        it = _timers.begin ();
+
+        //  If we have to wait to execute the item, same will be true for
+        //  all the following items because multimap is sorted. Thus we can
+        //  stop checking the subsequent timers.
+        if (it->first > current) {
+            res = it->first - current;
+            break;
+        }
+
+        //  Save and remove the timer because timer_event() call might delete
+        //  exactly this timer and then the iterator will be invalid.
+        timer_temp = it->second;
+        _timers.erase (it);
+
+        //  Trigger the timer.
+        timer_temp.sink->timer_event (timer_temp.id);
+
+    } while (!_timers.empty ());
+
+    //  Return the time to wait for the next timer (at least 1ms), or 0, if
+    //  there are no more timers.
+    return res;
+}
+
+zmq::worker_poller_base_t::worker_poller_base_t (const thread_ctx_t &ctx_) :
+    _ctx (ctx_)
+{
+}
+
+void zmq::worker_poller_base_t::stop_worker ()
+{
+    _worker.stop ();
+}
+
+void zmq::worker_poller_base_t::start (const char *name_)
+{
+    zmq_assert (get_load () > 0);
+    _ctx.start_thread (_worker, worker_routine, this, name_);
+}
+
+void zmq::worker_poller_base_t::check_thread () const
+{
+#ifndef NDEBUG
+    zmq_assert (!_worker.get_started () || _worker.is_current_thread ());
+#endif
+}
+
+void zmq::worker_poller_base_t::worker_routine (void *arg_)
+{
+    (static_cast<worker_poller_base_t *> (arg_))->loop ();
+}