90ab65f8c7
Pipes aren't really pollable on Windows. GLib emulates polling on pipes using separate reader/writer threads. This adds significant overhead and keeps a strong dependency on GLib. socketpair() function is absent on Windows as well. We implement it here in a loose way.
115 lines
2.7 KiB
C++
115 lines
2.7 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 "GlobalEvents.hxx"
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#include "event/WakeFD.hxx"
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#include "mpd_error.h"
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#include <atomic>
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#include <assert.h>
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#include <glib.h>
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#include <string.h>
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#include <errno.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "global_events"
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namespace GlobalEvents {
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static WakeFD wake_fd;
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static guint source_id;
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static std::atomic_uint flags;
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static Handler handlers[MAX];
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}
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/**
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* Invoke the callback for a certain event.
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*/
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static void
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InvokeGlobalEvent(GlobalEvents::Event event)
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{
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assert((unsigned)event < GlobalEvents::MAX);
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assert(GlobalEvents::handlers[event] != NULL);
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GlobalEvents::handlers[event]();
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}
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static gboolean
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GlobalEventCallback(G_GNUC_UNUSED GIOChannel *source,
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G_GNUC_UNUSED GIOCondition condition,
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G_GNUC_UNUSED gpointer data)
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{
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if (!GlobalEvents::wake_fd.Read())
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return true;
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const unsigned flags = GlobalEvents::flags.fetch_and(0);
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for (unsigned i = 0; i < GlobalEvents::MAX; ++i)
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if (flags & (1u << i))
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/* invoke the event handler */
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InvokeGlobalEvent(GlobalEvents::Event(i));
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return true;
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}
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void
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GlobalEvents::Initialize()
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{
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if (!wake_fd.Create())
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MPD_ERROR("Couldn't open pipe: %s", strerror(errno));
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#ifndef G_OS_WIN32
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GIOChannel *channel = g_io_channel_unix_new(wake_fd.Get());
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#else
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GIOChannel *channel = g_io_channel_win32_new_socket(wake_fd.Get());
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#endif
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source_id = g_io_add_watch(channel, G_IO_IN,
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GlobalEventCallback, NULL);
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g_io_channel_unref(channel);
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}
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void
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GlobalEvents::Deinitialize()
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{
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g_source_remove(source_id);
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wake_fd.Destroy();
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}
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void
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GlobalEvents::Register(Event event, Handler callback)
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{
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assert((unsigned)event < MAX);
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assert(handlers[event] == NULL);
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handlers[event] = callback;
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}
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void
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GlobalEvents::Emit(Event event)
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{
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assert((unsigned)event < MAX);
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const unsigned mask = 1u << unsigned(event);
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if ((GlobalEvents::flags.fetch_or(mask) & mask) == 0)
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wake_fd.Write();
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}
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