a357d84dce
Instead of creating a new eventfd for each DeferredMonitor instance, reuse EventLoop's eventfd, and add a std::list to EventLoop that manages the list of pending DeferredMonitors. This std::list is protected by the same mutex as the "calls" list. The bottom line is: reduced overhead because the per-instance eventfd was eliminated, slightly added overhead due to Mutex usage (but negligible), and we're thread-safe now. This subsystem is now good enough to replace EventLoop::AddCall().
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "DeferredMonitor.hxx"
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#include "Loop.hxx"
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void
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DeferredMonitor::Cancel()
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{
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#ifdef USE_INTERNAL_EVENTLOOP
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loop.RemoveDeferred(*this);
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#endif
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#ifdef USE_GLIB_EVENTLOOP
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const auto id = source_id.exchange(0);
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if (id != 0)
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g_source_remove(id);
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#endif
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}
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void
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DeferredMonitor::Schedule()
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{
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#ifdef USE_INTERNAL_EVENTLOOP
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loop.AddDeferred(*this);
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#endif
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#ifdef USE_GLIB_EVENTLOOP
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const unsigned id = loop.AddIdle(Callback, this);
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const auto old_id = source_id.exchange(id);
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if (old_id != 0)
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g_source_remove(old_id);
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#endif
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}
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#ifdef USE_GLIB_EVENTLOOP
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void
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DeferredMonitor::Run()
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{
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const auto id = source_id.exchange(0);
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if (id != 0)
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RunDeferred();
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}
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gboolean
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DeferredMonitor::Callback(gpointer data)
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{
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DeferredMonitor &monitor = *(DeferredMonitor *)data;
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monitor.Run();
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return false;
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}
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#endif
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