Main, IOThread: move GMainLoop setup code to class EventLoop

Makefile.am

@@ -353,7 +353,8 @@ libutil_a_SOURCES = \
 # Event loop library
 
 libevent_a_SOURCES = \
-	src/event/WakeFD.cxx
+	src/event/WakeFD.cxx src/event/WakeFD.hxx \
+	src/event/Loop.hxx
 
 # PCM library
 

src/ClientEvent.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "ClientInternal.hxx"
 #include "Main.hxx"
+#include "event/Loop.hxx"
 
 #include <assert.h>
 
@@ -83,7 +84,7 @@ client_in_event(G_GNUC_UNUSED GIOChannel *source, GIOCondition condition,
 
 	case COMMAND_RETURN_KILL:
 		client_close(client);
-		g_main_loop_quit(main_loop);
+		main_loop->Break();
 		return false;
 
 	case COMMAND_RETURN_CLOSE:

src/IOThread.cxx

@@ -17,9 +17,11 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "config.h"
 #include "IOThread.hxx"
 #include "thread/Mutex.hxx"
 #include "thread/Cond.hxx"
+#include "event/Loop.hxx"
 
 #include <assert.h>
 
@@ -27,8 +29,7 @@ static struct {
 	Mutex mutex;
 	Cond cond;
 
-	GMainContext *context;
+	EventLoop *loop;
-	GMainLoop *loop;
 	GThread *thread;
 } io;
 
@@ -36,10 +37,9 @@ void
 io_thread_run(void)
 {
 	assert(io_thread_inside());
-	assert(io.context != NULL);
 	assert(io.loop != NULL);
 
-	g_main_loop_run(io.loop);
+	io.loop->Run();
 }
 
 static gpointer
@@ -57,18 +57,15 @@ io_thread_func(G_GNUC_UNUSED gpointer arg)
 void
 io_thread_init(void)
 {
-	assert(io.context == NULL);
 	assert(io.loop == NULL);
 	assert(io.thread == NULL);
 
-	io.context = g_main_context_new();
+	io.loop = new EventLoop();
-	io.loop = g_main_loop_new(io.context, false);
 }
 
 bool
 io_thread_start(GError **error_r)
 {
-	assert(io.context != NULL);
 	assert(io.loop != NULL);
 	assert(io.thread == NULL);
 
@@ -86,7 +83,7 @@ io_thread_quit(void)
 {
 	assert(io.loop != NULL);
 
-	g_main_loop_quit(io.loop);
+	io.loop->Break();
 }
 
 void
@@ -98,17 +95,15 @@ io_thread_deinit(void)
 		g_thread_join(io.thread);
 	}
 
-	if (io.loop != NULL)
+	delete io.loop;
-		g_main_loop_unref(io.loop);
-
-	if (io.context != NULL)
-		g_main_context_unref(io.context);
 }
 
-GMainContext *
+EventLoop &
-io_thread_context(void)
+io_thread_get()
 {
-	return io.context;
+	assert(io.loop != nullptr);
+
+	return *io.loop;
 }
 
 bool
@@ -117,35 +112,6 @@ io_thread_inside(void)
 	return io.thread != NULL && g_thread_self() == io.thread;
 }
 
-guint
-io_thread_idle_add(GSourceFunc function, gpointer data)
-{
-	GSource *source = g_idle_source_new();
-	g_source_set_callback(source, function, data, NULL);
-	guint id = g_source_attach(source, io.context);
-	g_source_unref(source);
-	return id;
-}
-
-GSource *
-io_thread_timeout_add(guint interval_ms, GSourceFunc function, gpointer data)
-{
-	GSource *source = g_timeout_source_new(interval_ms);
-	g_source_set_callback(source, function, data, NULL);
-	g_source_attach(source, io.context);
-	return source;
-}
-
-GSource *
-io_thread_timeout_add_seconds(guint interval,
-			      GSourceFunc function, gpointer data)
-{
-	GSource *source = g_timeout_source_new_seconds(interval);
-	g_source_set_callback(source, function, data, NULL);
-	g_source_attach(source, io.context);
-	return source;
-}
-
 struct call_data {
 	GThreadFunc function;
 	gpointer data;
@@ -186,7 +152,7 @@ io_thread_call(GThreadFunc function, gpointer _data)
 		nullptr,
 	};
 
-	io_thread_idle_add(io_thread_call_func, &data);
+	io.loop->AddIdle(io_thread_call_func, &data);
 
 	io.mutex.lock();
 	while (!data.done)

src/IOThread.hxx

@@ -24,6 +24,8 @@
 
 #include <glib.h>
 
+class EventLoop;
+
 void
 io_thread_init(void);
 
@@ -50,8 +52,8 @@ void
 io_thread_deinit(void);
 
 gcc_pure
-GMainContext *
+EventLoop &
-io_thread_context(void);
+io_thread_get();
 
 /**
  * Is the current thread the I/O thread?
@@ -60,18 +62,6 @@ gcc_pure
 bool
 io_thread_inside(void);
 
-guint
-io_thread_idle_add(GSourceFunc function, gpointer data);
-
-gcc_malloc
-GSource *
-io_thread_timeout_add(guint interval_ms, GSourceFunc function, gpointer data);
-
-gcc_malloc
-GSource *
-io_thread_timeout_add_seconds(guint interval,
-			      GSourceFunc function, gpointer data);
-
 /**
  * Call a function synchronously in the I/O thread.
  */

src/InotifyQueue.cxx

@@ -20,6 +20,8 @@
 #include "config.h"
 #include "InotifyQueue.hxx"
 #include "UpdateGlue.hxx"
+#include "Main.hxx"
+#include "event/Loop.hxx"
 
 #include <list>
 #include <string>
@@ -93,8 +95,9 @@ mpd_inotify_enqueue(const char *uri_utf8)
 {
 	if (queue_source_id != 0)
 		g_source_remove(queue_source_id);
-	queue_source_id = g_timeout_add_seconds(INOTIFY_UPDATE_DELAY_S,
+	queue_source_id = main_loop->AddTimeoutSeconds(INOTIFY_UPDATE_DELAY_S,
-					mpd_inotify_run_update, NULL);
+						       mpd_inotify_run_update,
+						       nullptr);
 
 	for (auto i = inotify_queue.begin(), end = inotify_queue.end();
 	     i != end;) {

src/Main.cxx

@@ -45,6 +45,7 @@
 #include "Log.hxx"
 #include "GlobalEvents.hxx"
 #include "InputInit.hxx"
+#include "event/Loop.hxx"
 #include "IOThread.hxx"
 
 extern "C" {
@@ -96,7 +97,7 @@ enum {
 };
 
 GThread *main_task;
-GMainLoop *main_loop;
+EventLoop *main_loop;
 
 Partition *global_partition;
 
@@ -332,7 +333,7 @@ idle_event_emitted(void)
 static void
 shutdown_event_emitted(void)
 {
-	g_main_loop_quit(main_loop);
+	main_loop->Break();
 }
 
 int main(int argc, char *argv[])
@@ -401,7 +402,7 @@ int mpd_main(int argc, char *argv[])
 	daemonize_set_user();
 
 	main_task = g_thread_self();
-	main_loop = g_main_loop_new(NULL, FALSE);
+	main_loop = new EventLoop(EventLoop::Default());
 
 	GlobalEvents::Initialize();
 	GlobalEvents::Register(GlobalEvents::IDLE, idle_event_emitted);
@@ -504,7 +505,7 @@ int mpd_main(int argc, char *argv[])
 #endif
 
 	/* run the main loop */
-	g_main_loop_run(main_loop);
+	main_loop->Run();
 
 #ifdef WIN32
 	win32_app_stopping();
@@ -512,7 +513,7 @@ int mpd_main(int argc, char *argv[])
 
 	/* cleanup */
 
-	g_main_loop_unref(main_loop);
+	delete main_loop;
 
 #ifdef ENABLE_INOTIFY
 	mpd_inotify_finish();

src/Main.hxx

@@ -22,9 +22,11 @@
 
 #include <glib.h>
 
+class EventLoop;
+
 extern GThread *main_task;
 
-extern GMainLoop *main_loop;
+extern EventLoop *main_loop;
 
 extern struct Partition *global_partition;
 

src/SignalHandlers.cxx

@@ -24,6 +24,7 @@
 
 #include "Log.hxx"
 #include "Main.hxx"
+#include "event/Loop.hxx"
 #include "GlobalEvents.hxx"
 #include "mpd_error.h"
 
@@ -35,7 +36,7 @@
 
 static void exit_signal_handler(G_GNUC_UNUSED int signum)
 {
-	g_main_loop_quit(main_loop);
+	main_loop->Break();
 }
 
 static void reload_signal_handler(G_GNUC_UNUSED int signum)

src/StateFile.cxx

@@ -24,6 +24,8 @@
 #include "TextFile.hxx"
 #include "Partition.hxx"
 #include "Volume.hxx"
+#include "Main.hxx"
+#include "event/Loop.hxx"
 
 #include <glib.h>
 #include <assert.h>
@@ -137,8 +139,8 @@ state_file_init(const char *path, Partition &partition)
 	state_file_path = g_strdup(path);
 	state_file_read(partition);
 
-	save_state_source_id = g_timeout_add_seconds(5 * 60,
+	save_state_source_id =
-						     timer_save_state_file,
+		main_loop->AddTimeoutSeconds(5 * 60, timer_save_state_file,
 					     &partition);
 }
 

src/event/Loop.hxx

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_EVENT_LOOP_HXX
+#define MPD_EVENT_LOOP_HXX
+
+#include "check.h"
+#include "gcc.h"
+
+#include <glib.h>
+
+class EventLoop {
+	GMainContext *context;
+	GMainLoop *loop;
+
+public:
+	EventLoop()
+		:context(g_main_context_new()),
+		 loop(g_main_loop_new(context, false)) {}
+
+	struct Default {};
+	EventLoop(gcc_unused Default _dummy)
+		:context(g_main_context_ref(g_main_context_default())),
+		 loop(g_main_loop_new(context, false)) {}
+
+	~EventLoop() {
+		g_main_loop_unref(loop);
+		g_main_context_unref(context);
+	}
+
+	GMainContext *GetContext() {
+		return context;
+	}
+
+	void Break() {
+		g_main_loop_quit(loop);
+	}
+
+	void Run() {
+		g_main_loop_run(loop);
+	}
+
+	guint AddIdle(GSourceFunc function, gpointer data) {
+		GSource *source = g_idle_source_new();
+		g_source_set_callback(source, function, data, NULL);
+		guint id = g_source_attach(source, GetContext());
+		g_source_unref(source);
+		return id;
+	}
+
+	guint AddTimeout(guint interval_ms,
+			 GSourceFunc function, gpointer data) {
+		GSource *source = g_timeout_source_new(interval_ms);
+		g_source_set_callback(source, function, data, nullptr);
+		guint id = g_source_attach(source, GetContext());
+		g_source_unref(source);
+		return id;
+	}
+
+	guint AddTimeoutSeconds(guint interval_s,
+				GSourceFunc function, gpointer data) {
+		GSource *source = g_timeout_source_new_seconds(interval_s);
+		g_source_set_callback(source, function, data, nullptr);
+		guint id = g_source_attach(source, GetContext());
+		g_source_unref(source);
+		return id;
+	}
+};
+
+#endif /* MAIN_NOTIFY_H */

src/input/CurlInputPlugin.cxx

@@ -28,6 +28,7 @@ extern "C" {
 #include "input_internal.h"
 }
 
+#include "event/Loop.hxx"
 #include "IOThread.hxx"
 #include "glib_compat.h"
 
@@ -716,7 +717,8 @@ input_curl_init(const struct config_param *param,
 	}
 
 	curl.source = g_source_new(&curl_source_funcs, sizeof(*curl.source));
-	curl.source_id = g_source_attach(curl.source, io_thread_context());
+	curl.source_id = g_source_attach(curl.source,
+					 io_thread_get().GetContext());
 
 	return true;
 }

src/input/SoupInputPlugin.cxx

@@ -26,6 +26,7 @@ extern "C" {
 }
 
 #include "IOThread.hxx"
+#include "event/Loop.hxx"
 #include "conf.h"
 
 extern "C" {
@@ -105,7 +106,7 @@ input_soup_init(const struct config_param *param, GError **error_r)
 		soup_session_async_new_with_options(SOUP_SESSION_PROXY_URI,
 						    soup_proxy,
 						    SOUP_SESSION_ASYNC_CONTEXT,
-						    io_thread_context(),
+						    io_thread_get().GetContext(),
 						    NULL);
 
 	return true;

test/run_inotify.cxx

@@ -19,18 +19,19 @@
 
 #include "config.h"
 #include "InotifySource.hxx"
+#include "event/Loop.hxx"
 
 #include <glib.h>
 
 #include <sys/inotify.h>
 #include <signal.h>
 
-static GMainLoop *main_loop;
+static EventLoop *event_loop;
 
 static void
 exit_signal_handler(G_GNUC_UNUSED int signum)
 {
-	g_main_loop_quit(main_loop);
+	event_loop->Break();
 }
 
 enum {
@@ -78,7 +79,7 @@ int main(int argc, char **argv)
 		return 2;
 	}
 
-	main_loop = g_main_loop_new(NULL, false);
+	event_loop = new EventLoop(EventLoop::Default());
 
 	struct sigaction sa;
 	sa.sa_flags = 0;
@@ -87,8 +88,8 @@ int main(int argc, char **argv)
 	sigaction(SIGINT, &sa, NULL);
 	sigaction(SIGTERM, &sa, NULL);
 
-	g_main_loop_run(main_loop);
+	event_loop->Run();
-	g_main_loop_unref(main_loop);
 
 	mpd_inotify_source_free(source);
+	delete event_loop;
 }