Main: run the OS X native event loop

Makefile.am

@@ -130,6 +130,7 @@ libmpd_a_SOURCES = \
 	src/IOThread.cxx src/IOThread.hxx \
 	src/Instance.cxx src/Instance.hxx \
 	src/win32/Win32Main.cxx \
+	src/osx/OSXMain.cxx \
 	src/GlobalEvents.cxx src/GlobalEvents.hxx \
 	src/MixRampInfo.hxx \
 	src/MusicBuffer.cxx src/MusicBuffer.hxx \

NEWS

@@ -59,6 +59,7 @@ ver 0.19 (not yet released)
 * output
   - alsa: support native DSD playback
   - alsa: rename "DSD over USB" to "DoP"
+  - osx: fix hang after (un)plugging headphones
 * threads:
   - the update thread runs at "idle" priority
   - the output thread runs at "real-time" priority

src/Main.cxx

@@ -401,6 +401,8 @@ int main(int argc, char *argv[])
 {
 #ifdef WIN32
 	return win32_main(argc, argv);
+#elif __APPLE__
+	return osx_main(argc, argv);
 #else
 	return mpd_main(argc, argv);
 #endif

src/Main.hxx

@@ -75,4 +75,15 @@ win32_app_stopping(void);
 
 #endif
 
+#ifdef __APPLE__
+
+/* Runs the OS X native event loop in the main thread, and runs
+ * mpd_main on a new thread. This lets CoreAudio receive route
+ * change notifications (e.g. plugging or unplugging headphones).
+ * All hardware output on OS X ultimately uses CoreAudio internally.
+ */
+int osx_main(int argc, char *argv[]);
+
+#endif
+
 #endif

src/osx/OSXMain.cxx

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+#include "config.h"
+#include "Main.hxx"
+
+#ifdef __APPLE__
+
+#include <stdlib.h>
+#include <dispatch/dispatch.h>
+
+int osx_main(int argc, char *argv[])
+{
+	dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+		exit(mpd_main(argc, argv));
+	});
+	dispatch_main();
+	return EXIT_FAILURE; // unreachable, because dispatch_main never returns
+}
+
+#endif