player/Thread: move StartPlayerThread() into PlayerControl

Makefile.am

@@ -142,7 +142,7 @@ libmpd_a_SOURCES = \
 	src/Partition.cxx src/Partition.hxx \
 	src/Permission.cxx src/Permission.hxx \
 	src/player/CrossFade.cxx src/player/CrossFade.hxx \
-	src/player/Thread.cxx src/player/Thread.hxx \
+	src/player/Thread.cxx \
 	src/player/Control.cxx src/player/Control.hxx \
 	src/player/Listener.hxx \
 	src/player/Outputs.hxx \

src/Main.cxx

@@ -24,7 +24,6 @@
 #include "PlaylistFile.hxx"
 #include "MusicChunk.hxx"
 #include "StateFile.hxx"
-#include "player/Thread.hxx"
 #include "Mapper.hxx"
 #include "Permission.hxx"
 #include "Listen.hxx"
@@ -613,7 +612,7 @@ mpd_main_after_fork(const ConfigData &raw_config, const Config &config)
 	ZeroconfInit(raw_config, instance->event_loop);
 
 	for (auto &partition : instance->partitions)
-		StartPlayerThread(partition.pc);
+		partition.pc.StartThread();
 
 #ifdef ENABLE_DATABASE
 	if (create_db) {

src/command/PartitionCommands.cxx

@@ -25,7 +25,6 @@
 #include "IdleFlags.hxx"
 #include "client/Client.hxx"
 #include "client/Response.hxx"
-#include "player/Thread.hxx"
 #include "util/CharUtil.hxx"
 
 CommandResult
@@ -111,7 +110,7 @@ handle_newpartition(Client &client, Request request, Response &response)
 					ReplayGainConfig(),
 					partition.pc);
 	partition.UpdateEffectiveReplayGainMode();
-	StartPlayerThread(partition.pc);
+	partition.pc.StartThread();
 	partition.pc.LockUpdateAudio();
 
 	instance.EmitIdle(IDLE_PARTITION);

src/player/Control.hxx

@@ -238,6 +238,13 @@ struct PlayerControl final : AudioOutputClient {
 	~PlayerControl() noexcept;
 
 	/**
+	 * Throws on error.
+	 */
+	void StartThread() {
+		thread.Start();
+	}
+
+	/**
 	 * Locks the object.
 	 */
 	void Lock() const noexcept {

src/player/Thread.cxx

@@ -17,8 +17,25 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+/* \file
+ *
+ * The player thread controls the playback.  It acts as a bridge
+ * between the decoder thread and the output thread(s): it receives
+ * #MusicChunk objects from the decoder, optionally mixes them
+ * (cross-fading), applies software volume, and sends them to the
+ * audio outputs via audio_output_all_play().
+ *
+ * It is controlled by the main thread (the playlist code), see
+ * Control.hxx.  The playlist enqueues new songs into the player
+ * thread and sends it commands.
+ *
+ * The player thread itself does not do any I/O.  It synchronizes with
+ * other threads via #GMutex and #GCond objects, and passes
+ * #MusicChunk instances around in #MusicPipe objects.
+ */
+
 #include "config.h"
-#include "Thread.hxx"
+#include "Control.hxx"
 #include "Outputs.hxx"
 #include "Listener.hxx"
 #include "decoder/Control.hxx"
@@ -27,7 +44,6 @@
 #include "MusicChunk.hxx"
 #include "song/DetachedSong.hxx"
 #include "CrossFade.hxx"
-#include "Control.hxx"
 #include "tag/Tag.hxx"
 #include "Idle.hxx"
 #include "util/Domain.hxx"
@@ -1170,11 +1186,3 @@ PlayerControl::RunThread() noexcept
 		}
 	}
 }
-
-void
-StartPlayerThread(PlayerControl &pc)
-{
-	assert(!pc.thread.IsDefined());
-
-	pc.thread.Start();
-}

src/player/Thread.hxx

-/*
- * Copyright 2003-2017 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.
- */
-
-/* \file
- *
- * The player thread controls the playback.  It acts as a bridge
- * between the decoder thread and the output thread(s): it receives
- * #MusicChunk objects from the decoder, optionally mixes them
- * (cross-fading), applies software volume, and sends them to the
- * audio outputs via audio_output_all_play().
- *
- * It is controlled by the main thread (the playlist code), see
- * Control.hxx.  The playlist enqueues new songs into the player
- * thread and sends it commands.
- *
- * The player thread itself does not do any I/O.  It synchronizes with
- * other threads via #GMutex and #GCond objects, and passes
- * #MusicChunk instances around in #MusicPipe objects.
- */
-
-#ifndef MPD_PLAYER_THREAD_HXX
-#define MPD_PLAYER_THREAD_HXX
-
-struct PlayerControl;
-
-void
-StartPlayerThread(PlayerControl &pc);
-
-#endif