playlist: renamed global "playlist" variable to "g_playlist"

Export the "g_playlist" variable, and pass it to all playlist
functions.  This way, we can split playlist.c easier into separate
parts.  The code which initializes the singleton variable is moved to
playlist_global.c.

1 files changed, 310 insertions, 306 deletions

diff --git a/src/playlist.c b/src/playlist.c
index 97b6b0fad..0a32ce98b 100644
--- a/src/playlist.c
+++ b/src/playlist.c
@@ -18,7 +18,6 @@
 
 #include "playlist.h"
 #include "playlist_save.h"
-#include "playlist_state.h"
 #include "queue_print.h"
 #include "locate.h"
 #include "player_control.h"
@@ -32,7 +31,6 @@
 #include "stored_playlist.h"
 #include "ack.h"
 #include "idle.h"
-#include "event_pipe.h"
 
 #include <glib.h>
 
@@ -49,105 +47,87 @@
  */
 #define PLAYLIST_PREV_UNLESS_ELAPSED    10
 
-/** the global playlist object */
-static struct playlist playlist;
-
-static void playPlaylistOrderNumber(int orderNum);
+static void
+playPlaylistOrderNumber(struct playlist *playlist, int orderNum);
 
-static void incrPlaylistVersion(void)
+static void incrPlaylistVersion(struct playlist *playlist)
 {
-	queue_increment_version(&playlist.queue);
+	queue_increment_version(&playlist->queue);
 
 	idle_add(IDLE_PLAYLIST);
 }
 
-void playlistVersionChange(void)
+void playlistVersionChange(struct playlist *playlist)
 {
-	queue_modify_all(&playlist.queue);
+	queue_modify_all(&playlist->queue);
 	idle_add(IDLE_PLAYLIST);
 }
 
-static void
-playlist_tag_event(void)
+void
+playlist_tag_changed(struct playlist *playlist)
 {
-	if (!playlist.playing)
+	if (!playlist->playing)
 		return;
 
-	assert(playlist.current >= 0);
+	assert(playlist->current >= 0);
 
-	queue_modify(&playlist.queue, playlist.current);
+	queue_modify(&playlist->queue, playlist->current);
 	idle_add(IDLE_PLAYLIST);
 }
 
-void initPlaylist(void)
+void
+playlist_init(struct playlist *playlist)
 {
-	queue_init(&playlist.queue,
+	queue_init(&playlist->queue,
 		   config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
 				       DEFAULT_PLAYLIST_MAX_LENGTH));
 
-	playlist.queued = -1;
-	playlist.current = -1;
-
-	event_pipe_register(PIPE_EVENT_TAG, playlist_tag_event);
+	playlist->queued = -1;
+	playlist->current = -1;
 }
 
-void finishPlaylist(void)
-{
-	queue_finish(&playlist.queue);
-}
-
-const struct queue *
-playlist_get_queue(void)
+void
+playlist_finish(struct playlist *playlist)
 {
-	return &playlist.queue;
+	queue_finish(&playlist->queue);
 }
 
-void clearPlaylist(void)
+void clearPlaylist(struct playlist *playlist)
 {
-	stopPlaylist();
+	stopPlaylist(playlist);
 
 	/* make sure there are no references to allocated songs
 	   anymore */
-	for (unsigned i = 0; i < queue_length(&playlist.queue); i++) {
-		const struct song *song = queue_get(&playlist.queue, i);
+	for (unsigned i = 0; i < queue_length(&playlist->queue); i++) {
+		const struct song *song = queue_get(&playlist->queue, i);
 		if (!song_in_database(song))
 			pc_song_deleted(song);
 	}
 
-	queue_clear(&playlist.queue);
+	queue_clear(&playlist->queue);
 
-	playlist.current = -1;
-
-	incrPlaylistVersion();
-}
-
-void savePlaylistState(FILE *fp)
-{
-	playlist_state_save(fp, &playlist);
-}
+	playlist->current = -1;
 
-void readPlaylistState(FILE *fp)
-{
-	playlist_state_restore(fp, &playlist);
+	incrPlaylistVersion(playlist);
 }
 
 /**
  * Queue a song, addressed by its order number.
  */
 static void
-playlist_queue_song_order(unsigned order)
+playlist_queue_song_order(struct playlist *playlist, unsigned order)
 {
 	struct song *song;
 	char *uri;
 
-	assert(queue_valid_order(&playlist.queue, order));
+	assert(queue_valid_order(&playlist->queue, order));
 
-	playlist.queued = order;
+	playlist->queued = order;
 
-	song = queue_get_order(&playlist.queue, order);
+	song = queue_get_order(&playlist->queue, order);
 	uri = song_get_uri(song);
 	g_debug("playlist: queue song %i:\"%s\"",
-		playlist.queued, uri);
+		playlist->queued, uri);
 	g_free(uri);
 
 	queueSong(song);
@@ -157,14 +137,14 @@ playlist_queue_song_order(unsigned order)
  * Check if the player thread has already started playing the "queued"
  * song.
  */
-static void syncPlaylistWithQueue(void)
+static void syncPlaylistWithQueue(struct playlist *playlist)
 {
-	if (pc.next_song == NULL && playlist.queued != -1) {
+	if (pc.next_song == NULL && playlist->queued != -1) {
 		/* queued song has started: copy queued to current,
 		   and notify the clients */
 
-		playlist.current = playlist.queued;
-		playlist.queued = -1;
+		playlist->current = playlist->queued;
+		playlist->queued = -1;
 
 		idle_add(IDLE_PLAYER);
 	}
@@ -175,12 +155,12 @@ static void syncPlaylistWithQueue(void)
  * there is none (yet?) or if MPD isn't playing.
  */
 static const struct song *
-playlist_get_queued_song(void)
+playlist_get_queued_song(struct playlist *playlist)
 {
-	if (!playlist.playing || playlist.queued < 0)
+	if (!playlist->playing || playlist->queued < 0)
 		return NULL;
 
-	return queue_get_order(&playlist.queue, playlist.queued);
+	return queue_get_order(&playlist->queue, playlist->queued);
 }
 
 /**
@@ -192,61 +172,62 @@ playlist_get_queued_song(void)
  * playlist_get_queued_song()
  */
 static void
-playlist_update_queued_song(const struct song *prev)
+playlist_update_queued_song(struct playlist *playlist, const struct song *prev)
 {
 	int next_order;
 	const struct song *next_song;
 
-	if (!playlist.playing)
+	if (!playlist->playing)
 		return;
 
-	assert(!queue_is_empty(&playlist.queue));
-	assert((playlist.queued < 0) == (prev == NULL));
+	assert(!queue_is_empty(&playlist->queue));
+	assert((playlist->queued < 0) == (prev == NULL));
 
-	next_order = playlist.current >= 0
-		? queue_next_order(&playlist.queue, playlist.current)
+	next_order = playlist->current >= 0
+		? queue_next_order(&playlist->queue, playlist->current)
 		: 0;
 
-	if (next_order == 0 && playlist.queue.random) {
+	if (next_order == 0 && playlist->queue.random) {
 		/* shuffle the song order again, so we get a different
 		   order each time the playlist is played
 		   completely */
 		unsigned current_position =
-			queue_order_to_position(&playlist.queue,
-						playlist.current);
+			queue_order_to_position(&playlist->queue,
+						playlist->current);
 
-		queue_shuffle_order(&playlist.queue);
+		queue_shuffle_order(&playlist->queue);
 
-		/* make sure that the playlist.current still points to
+		/* make sure that the playlist->current still points to
 		   the current song, after the song order has been
 		   shuffled */
-		playlist.current =
-			queue_position_to_order(&playlist.queue,
+		playlist->current =
+			queue_position_to_order(&playlist->queue,
 						current_position);
 	}
 
 	if (next_order >= 0)
-		next_song = queue_get_order(&playlist.queue, next_order);
+		next_song = queue_get_order(&playlist->queue, next_order);
 	else
 		next_song = NULL;
 
 	if (prev != NULL && next_song != prev) {
 		/* clear the currently queued song */
 		pc_cancel();
-		playlist.queued = -1;
+		playlist->queued = -1;
 	}
 
 	if (next_order >= 0) {
 		if (next_song != prev)
-			playlist_queue_song_order(next_order);
+			playlist_queue_song_order(playlist, next_order);
 		else
-			playlist.queued = next_order;
+			playlist->queued = next_order;
 	}
 }
 
 #ifndef WIN32
 enum playlist_result
-playlist_append_file(const char *path, int uid, unsigned *added_id)
+playlist_append_file(struct playlist *playlist, const char *path, int uid,
+		     unsigned *added_id)
 {
 	int ret;
 	struct stat st;
@@ -268,7 +249,7 @@ playlist_append_file(const char *path, int uid, unsigned *added_id)
 	if (song == NULL)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return addSongToPlaylist(song, added_id);
+	return addSongToPlaylist(playlist, song, added_id);
 }
 #endif
 
@@ -287,7 +268,8 @@ song_by_url(const char *url)
 	return NULL;
 }
 
-enum playlist_result addToPlaylist(const char *url, unsigned *added_id)
+enum playlist_result
+addToPlaylist(struct playlist *playlist, const char *url, unsigned *added_id)
 {
 	struct song *song;
 
@@ -297,39 +279,40 @@ enum playlist_result addToPlaylist(const char *url, unsigned *added_id)
 	if (song == NULL)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return addSongToPlaylist(song, added_id);
+	return addSongToPlaylist(playlist, song, added_id);
 }
 
 enum playlist_result
-addSongToPlaylist(struct song *song, unsigned *added_id)
+addSongToPlaylist(struct playlist *playlist,
+		  struct song *song, unsigned *added_id)
 {
 	const struct song *queued;
 	unsigned id;
 
-	if (queue_is_full(&playlist.queue))
+	if (queue_is_full(&playlist->queue))
 		return PLAYLIST_RESULT_TOO_LARGE;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	id = queue_append(&playlist.queue, song);
+	id = queue_append(&playlist->queue, song);
 
-	if (playlist.queue.random) {
+	if (playlist->queue.random) {
 		/* shuffle the new song into the list of remaining
 		   songs to play */
 
 		unsigned start;
-		if (playlist.queued >= 0)
-			start = playlist.queued + 1;
+		if (playlist->queued >= 0)
+			start = playlist->queued + 1;
 		else
-			start = playlist.current + 1;
-		if (start < queue_length(&playlist.queue))
-			queue_shuffle_order_last(&playlist.queue, start,
-						 queue_length(&playlist.queue));
+			start = playlist->current + 1;
+		if (start < queue_length(&playlist->queue))
+			queue_shuffle_order_last(&playlist->queue, start,
+						 queue_length(&playlist->queue));
 	}
 
-	incrPlaylistVersion();
+	incrPlaylistVersion(playlist);
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
 	if (added_id)
 		*added_id = id;
@@ -337,180 +320,185 @@ addSongToPlaylist(struct song *song, unsigned *added_id)
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result swapSongsInPlaylist(unsigned song1, unsigned song2)
+enum playlist_result
+swapSongsInPlaylist(struct playlist *playlist, unsigned song1, unsigned song2)
 {
 	const struct song *queued;
 
-	if (!queue_valid_position(&playlist.queue, song1) ||
-	    !queue_valid_position(&playlist.queue, song2))
+	if (!queue_valid_position(&playlist->queue, song1) ||
+	    !queue_valid_position(&playlist->queue, song2))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	queue_swap(&playlist.queue, song1, song2);
+	queue_swap(&playlist->queue, song1, song2);
 
-	if (playlist.queue.random) {
-		/* update the queue order, so that playlist.current
+	if (playlist->queue.random) {
+		/* update the queue order, so that playlist->current
 		   still points to the current song order */
 
-		queue_swap_order(&playlist.queue,
-				 queue_position_to_order(&playlist.queue,
+		queue_swap_order(&playlist->queue,
+				 queue_position_to_order(&playlist->queue,
 							 song1),
-				 queue_position_to_order(&playlist.queue,
+				 queue_position_to_order(&playlist->queue,
 							 song2));
 	} else {
 		/* correct the "current" song order */
 
-		if (playlist.current == (int)song1)
-			playlist.current = song2;
-		else if (playlist.current == (int)song2)
-			playlist.current = song1;
+		if (playlist->current == (int)song1)
+			playlist->current = song2;
+		else if (playlist->current == (int)song2)
+			playlist->current = song1;
 	}
 
-	incrPlaylistVersion();
+	incrPlaylistVersion(playlist);
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result swapSongsInPlaylistById(unsigned id1, unsigned id2)
+enum playlist_result
+swapSongsInPlaylistById(struct playlist *playlist, unsigned id1, unsigned id2)
 {
-	int song1 = queue_id_to_position(&playlist.queue, id1);
-	int song2 = queue_id_to_position(&playlist.queue, id2);
+	int song1 = queue_id_to_position(&playlist->queue, id1);
+	int song2 = queue_id_to_position(&playlist->queue, id2);
 
 	if (song1 < 0 || song2 < 0)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return swapSongsInPlaylist(song1, song2);
+	return swapSongsInPlaylist(playlist, song1, song2);
 }
 
-enum playlist_result deleteFromPlaylist(unsigned song)
+enum playlist_result
+deleteFromPlaylist(struct playlist *playlist, unsigned song)
 {
 	const struct song *queued;
 	unsigned songOrder;
 
-	if (song >= queue_length(&playlist.queue))
+	if (song >= queue_length(&playlist->queue))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	songOrder = queue_position_to_order(&playlist.queue, song);
+	songOrder = queue_position_to_order(&playlist->queue, song);
 
-	if (playlist.playing && playlist.current == (int)songOrder) {
+	if (playlist->playing && playlist->current == (int)songOrder) {
 		bool paused = getPlayerState() == PLAYER_STATE_PAUSE;
 
 		/* the current song is going to be deleted: stop the player */
 
 		playerWait();
-		playlist.playing = false;
+		playlist->playing = false;
 
 		/* see which song is going to be played instead */
 
-		playlist.current = queue_next_order(&playlist.queue,
-						    playlist.current);
-		if (playlist.current == (int)songOrder)
-			playlist.current = -1;
+		playlist->current = queue_next_order(&playlist->queue,
+						     playlist->current);
+		if (playlist->current == (int)songOrder)
+			playlist->current = -1;
 
-		if (playlist.current >= 0 && !paused)
+		if (playlist->current >= 0 && !paused)
 			/* play the song after the deleted one */
-			playPlaylistOrderNumber(playlist.current);
+			playPlaylistOrderNumber(playlist, playlist->current);
 		else
 			/* no songs left to play, stop playback
 			   completely */
-			stopPlaylist();
+			stopPlaylist(playlist);
 
 		queued = NULL;
 	}
 
 	/* now do it: remove the song */
 
-	if (!song_in_database(queue_get(&playlist.queue, song)))
-		pc_song_deleted(queue_get(&playlist.queue, song));
+	if (!song_in_database(queue_get(&playlist->queue, song)))
+		pc_song_deleted(queue_get(&playlist->queue, song));
 
-	queue_delete(&playlist.queue, song);
+	queue_delete(&playlist->queue, song);
 
-	incrPlaylistVersion();
+	incrPlaylistVersion(playlist);
 
 	/* update the "current" and "queued" variables */
 
-	if (playlist.current > (int)songOrder) {
-		playlist.current--;
+	if (playlist->current > (int)songOrder) {
+		playlist->current--;
 	}
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result deleteFromPlaylistById(unsigned id)
+enum playlist_result
+deleteFromPlaylistById(struct playlist *playlist, unsigned id)
 {
-	int song = queue_id_to_position(&playlist.queue, id);
+	int song = queue_id_to_position(&playlist->queue, id);
 	if (song < 0)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return deleteFromPlaylist(song);
+	return deleteFromPlaylist(playlist, song);
 }
 
 void
-deleteASongFromPlaylist(const struct song *song)
+deleteASongFromPlaylist(struct playlist *playlist, const struct song *song)
 {
-	for (int i = queue_length(&playlist.queue) - 1; i >= 0; --i)
-		if (song == queue_get(&playlist.queue, i))
-			deleteFromPlaylist(i);
+	for (int i = queue_length(&playlist->queue) - 1; i >= 0; --i)
+		if (song == queue_get(&playlist->queue, i))
+			deleteFromPlaylist(playlist, i);
 
 	pc_song_deleted(song);
 }
 
-void stopPlaylist(void)
+void stopPlaylist(struct playlist *playlist)
 {
-	if (!playlist.playing)
+	if (!playlist->playing)
 		return;
 
-	assert(playlist.current >= 0);
+	assert(playlist->current >= 0);
 
 	g_debug("playlist: stop");
 	playerWait();
-	playlist.queued = -1;
-	playlist.playing = false;
+	playlist->queued = -1;
+	playlist->playing = false;
 
-	if (playlist.queue.random) {
+	if (playlist->queue.random) {
 		/* shuffle the playlist, so the next playback will
 		   result in a new random order */
 
 		unsigned current_position =
-			queue_order_to_position(&playlist.queue,
-						playlist.current);
+			queue_order_to_position(&playlist->queue,
+						playlist->current);
 
-		queue_shuffle_order(&playlist.queue);
+		queue_shuffle_order(&playlist->queue);
 
 		/* make sure that "current" stays valid, and the next
 		   "play" command plays the same song again */
-		playlist.current =
-			queue_position_to_order(&playlist.queue,
+		playlist->current =
+			queue_position_to_order(&playlist->queue,
 						current_position);
 	}
 }
 
-static void playPlaylistOrderNumber(int orderNum)
+static void
+playPlaylistOrderNumber(struct playlist *playlist, int orderNum)
 {
 	struct song *song;
 	char *uri;
 
-	playlist.playing = true;
-	playlist.queued = -1;
+	playlist->playing = true;
+	playlist->queued = -1;
 
-	song = queue_get_order(&playlist.queue, orderNum);
+	song = queue_get_order(&playlist->queue, orderNum);
 
 	uri = song_get_uri(song);
 	g_debug("playlist: play %i:\"%s\"", orderNum, uri);
 	g_free(uri);
 
 	playerPlay(song);
-	playlist.current = orderNum;
+	playlist->current = orderNum;
 }
 
-enum playlist_result playPlaylist(int song)
+enum playlist_result playPlaylist(struct playlist *playlist, int song)
 {
 	unsigned i = song;
 
@@ -519,10 +507,10 @@ enum playlist_result playPlaylist(int song)
 	if (song == -1) {
 		/* play any song ("current" song, or the first song */
 
-		if (queue_is_empty(&playlist.queue))
+		if (queue_is_empty(&playlist->queue))
 			return PLAYLIST_RESULT_SUCCESS;
 
-		if (playlist.playing) {
+		if (playlist->playing) {
 			/* already playing: unpause playback, just in
 			   case it was paused, and return */
 			playerSetPause(0);
@@ -530,61 +518,63 @@ enum playlist_result playPlaylist(int song)
 		}
 
 		/* select a song: "current" song, or the first one */
-		i = playlist.current >= 0
-			? playlist.current
+		i = playlist->current >= 0
+			? playlist->current
 			: 0;
-	} else if (!queue_valid_position(&playlist.queue, song))
+	} else if (!queue_valid_position(&playlist->queue, song))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
-	if (playlist.queue.random) {
+	if (playlist->queue.random) {
 		if (song >= 0)
 			/* "i" is currently the song position (which
 			   would be equal to the order number in
 			   no-random mode); convert it to a order
 			   number, because random mode is enabled */
-			i = queue_position_to_order(&playlist.queue, song);
+			i = queue_position_to_order(&playlist->queue, song);
 
-		if (!playlist.playing)
-			playlist.current = 0;
+		if (!playlist->playing)
+			playlist->current = 0;
 
 		/* swap the new song with the previous "current" one,
 		   so playback continues as planned */
-		queue_swap_order(&playlist.queue,
-				 i, playlist.current);
-		i = playlist.current;
+		queue_swap_order(&playlist->queue,
+				 i, playlist->current);
+		i = playlist->current;
 	}
 
-	playlist.stop_on_error = false;
-	playlist.error_count = 0;
+	playlist->stop_on_error = false;
+	playlist->error_count = 0;
 
-	playPlaylistOrderNumber(i);
+	playPlaylistOrderNumber(playlist, i);
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result playPlaylistById(int id)
+enum playlist_result
+playPlaylistById(struct playlist *playlist, int id)
 {
 	int song;
 
 	if (id == -1) {
-		return playPlaylist(id);
+		return playPlaylist(playlist, id);
 	}
 
-	song = queue_id_to_position(&playlist.queue, id);
+	song = queue_id_to_position(&playlist->queue, id);
 	if (song < 0)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return playPlaylist(song);
+	return playPlaylist(playlist, song);
 }
 
-static void playPlaylistIfPlayerStopped(void);
+static void
+playPlaylistIfPlayerStopped(struct playlist *playlist);
 
 /**
  * This is the "PLAYLIST" event handler.  It is invoked by the player
  * thread whenever it requests a new queued song, or when it exits.
  */
-void syncPlayerAndPlaylist(void)
+void syncPlayerAndPlaylist(struct playlist *playlist)
 {
-	if (!playlist.playing)
+	if (!playlist->playing)
 		/* this event has reached us out of sync: we aren't
 		   playing anymore; ignore the event */
 		return;
@@ -594,364 +584,378 @@ void syncPlayerAndPlaylist(void)
 		   should be restarted with the next song.  That can
 		   happen if the playlist isn't filling the queue fast
 		   enough */
-		playPlaylistIfPlayerStopped();
+		playPlaylistIfPlayerStopped(playlist);
 	else {
 		/* check if the player thread has already started
 		   playing the queued song */
-		syncPlaylistWithQueue();
+		syncPlaylistWithQueue(playlist);
 
 		/* make sure the queued song is always set (if
 		   possible) */
 		if (pc.next_song == NULL)
-			playlist_update_queued_song(NULL);
+			playlist_update_queued_song(playlist, NULL);
 	}
 }
 
-void nextSongInPlaylist(void)
+void
+nextSongInPlaylist(struct playlist *playlist)
 {
 	int next_order;
 
-	if (!playlist.playing)
+	if (!playlist->playing)
 		return;
 
-	assert(!queue_is_empty(&playlist.queue));
-	assert(queue_valid_order(&playlist.queue, playlist.current));
+	assert(!queue_is_empty(&playlist->queue));
+	assert(queue_valid_order(&playlist->queue, playlist->current));
 
-	syncPlaylistWithQueue();
+	syncPlaylistWithQueue(playlist);
 
-	playlist.stop_on_error = false;
+	playlist->stop_on_error = false;
 
 	/* determine the next song from the queue's order list */
 
-	next_order = queue_next_order(&playlist.queue, playlist.current);
+	next_order = queue_next_order(&playlist->queue, playlist->current);
 	if (next_order < 0) {
 		/* no song after this one: stop playback */
-		stopPlaylist();
+		stopPlaylist(playlist);
 		return;
 	}
 
-	if (next_order == 0 && playlist.queue.random) {
+	if (next_order == 0 && playlist->queue.random) {
 		/* The queue told us that the next song is the first
 		   song.  This means we are in repeat mode.  Shuffle
 		   the queue order, so this time, the user hears the
 		   songs in a different than before */
-		assert(playlist.queue.repeat);
+		assert(playlist->queue.repeat);
 
-		queue_shuffle_order(&playlist.queue);
+		queue_shuffle_order(&playlist->queue);
 
-		/* note that playlist.current and playlist.queued are
+		/* note that playlist->current and playlist->queued are
 		   now invalid, but playPlaylistOrderNumber() will
 		   discard them anyway */
 	}
 
-	playPlaylistOrderNumber(next_order);
+	playPlaylistOrderNumber(playlist, next_order);
 }
 
 /**
  * The player has stopped for some reason.  Check the error, and
  * decide whether to re-start playback
  */
-static void playPlaylistIfPlayerStopped(void)
+static void
+playPlaylistIfPlayerStopped(struct playlist *playlist)
 {
 	enum player_error error;
 
-	assert(playlist.playing);
+	assert(playlist->playing);
 	assert(getPlayerState() == PLAYER_STATE_STOP);
 
 	error = getPlayerError();
 	if (error == PLAYER_ERROR_NOERROR)
-		playlist.error_count = 0;
+		playlist->error_count = 0;
 	else
-		++playlist.error_count;
+		++playlist->error_count;
 
-	if ((playlist.stop_on_error && error != PLAYER_ERROR_NOERROR) ||
+	if ((playlist->stop_on_error && error != PLAYER_ERROR_NOERROR) ||
 	    error == PLAYER_ERROR_AUDIO || error == PLAYER_ERROR_SYSTEM ||
-	    playlist.error_count >= queue_length(&playlist.queue))
+	    playlist->error_count >= queue_length(&playlist->queue))
 		/* too many errors, or critical error: stop
 		   playback */
-		stopPlaylist();
+		stopPlaylist(playlist);
 	else
 		/* continue playback at the next song */
-		nextSongInPlaylist();
+		nextSongInPlaylist(playlist);
 }
 
-bool getPlaylistRepeatStatus(void)
+bool
+getPlaylistRepeatStatus(struct playlist *playlist)
 {
-	return playlist.queue.repeat;
+	return playlist->queue.repeat;
 }
 
-bool getPlaylistRandomStatus(void)
+bool
+getPlaylistRandomStatus(struct playlist *playlist)
 {
-	return playlist.queue.random;
+	return playlist->queue.random;
 }
 
-void setPlaylistRepeatStatus(bool status)
+void setPlaylistRepeatStatus(struct playlist *playlist, bool status)
 {
-	if (status == playlist.queue.repeat)
+	if (status == playlist->queue.repeat)
 		return;
 
-	playlist.queue.repeat = status;
+	playlist->queue.repeat = status;
 
 	/* if the last song is currently being played, the "next song"
 	   might change when repeat mode is toggled */
-	playlist_update_queued_song(playlist_get_queued_song());
+	playlist_update_queued_song(playlist,
+				    playlist_get_queued_song(playlist));
 
 	idle_add(IDLE_OPTIONS);
 }
 
-enum playlist_result moveSongInPlaylist(unsigned from, int to)
+enum playlist_result
+moveSongInPlaylist(struct playlist *playlist, unsigned from, int to)
 {
 	const struct song *queued;
 	int currentSong;
 
-	if (!queue_valid_position(&playlist.queue, from))
+	if (!queue_valid_position(&playlist->queue, from))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
-	if ((to >= 0 && to >= (int)queue_length(&playlist.queue)) ||
-	    (to < 0 && abs(to) > (int)queue_length(&playlist.queue)))
+	if ((to >= 0 && to >= (int)queue_length(&playlist->queue)) ||
+	    (to < 0 && abs(to) > (int)queue_length(&playlist->queue)))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
 	if ((int)from == to) /* no-op */
 		return PLAYLIST_RESULT_SUCCESS;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
 	/*
 	 * (to < 0) => move to offset from current song
 	 * (-playlist.length == to) => move to position BEFORE current song
 	 */
-	currentSong = playlist.current >= 0
-		? (int)queue_order_to_position(&playlist.queue,
-					      playlist.current)
+	currentSong = playlist->current >= 0
+		? (int)queue_order_to_position(&playlist->queue,
+					      playlist->current)
 		: -1;
-	if (to < 0 && playlist.current >= 0) {
+	if (to < 0 && playlist->current >= 0) {
 		if ((unsigned)currentSong == from)
 			/* no-op, can't be moved to offset of itself */
 			return PLAYLIST_RESULT_SUCCESS;
-		to = (currentSong + abs(to)) % queue_length(&playlist.queue);
+		to = (currentSong + abs(to)) % queue_length(&playlist->queue);
 	}
 
-	queue_move(&playlist.queue, from, to);
+	queue_move(&playlist->queue, from, to);
 
-	if (!playlist.queue.random) {
+	if (!playlist->queue.random) {
 		/* update current/queued */
-		if (playlist.current == (int)from)
-			playlist.current = to;
-		else if (playlist.current > (int)from &&
-			 playlist.current <= to) {
-			playlist.current--;
-		} else if (playlist.current >= to &&
-			   playlist.current < (int)from) {
-			playlist.current++;
+		if (playlist->current == (int)from)
+			playlist->current = to;
+		else if (playlist->current > (int)from &&
+			 playlist->current <= to) {
+			playlist->current--;
+		} else if (playlist->current >= to &&
+			   playlist->current < (int)from) {
+			playlist->current++;
 		}
 	}
 
-	incrPlaylistVersion();
+	incrPlaylistVersion(playlist);
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result moveSongInPlaylistById(unsigned id1, int to)
+enum playlist_result
+moveSongInPlaylistById(struct playlist *playlist, unsigned id1, int to)
 {
-	int song = queue_id_to_position(&playlist.queue, id1);
+	int song = queue_id_to_position(&playlist->queue, id1);
 	if (song < 0)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return moveSongInPlaylist(song, to);
+	return moveSongInPlaylist(playlist, song, to);
 }
 
-static void orderPlaylist(void)
+static void orderPlaylist(struct playlist *playlist)
 {
-	if (playlist.current >= 0)
+	if (playlist->current >= 0)
 		/* update playlist.current, order==position now */
-		playlist.current = queue_order_to_position(&playlist.queue,
-							   playlist.current);
+		playlist->current = queue_order_to_position(&playlist->queue,
+							    playlist->current);
 
-	queue_restore_order(&playlist.queue);
+	queue_restore_order(&playlist->queue);
 }
 
-void setPlaylistRandomStatus(bool status)
+void setPlaylistRandomStatus(struct playlist *playlist, bool status)
 {
 	const struct song *queued;
 
-	if (status == playlist.queue.random)
+	if (status == playlist->queue.random)
 		return;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	playlist.queue.random = status;
+	playlist->queue.random = status;
 
-	if (playlist.queue.random) {
+	if (playlist->queue.random) {
 		/* shuffle the queue order, but preserve
-		   playlist.current */
+		   playlist->current */
 
-		int current_position = playlist.current >= 0
-			? (int)queue_order_to_position(&playlist.queue,
-						       playlist.current)
+		int current_position = playlist->current >= 0
+			? (int)queue_order_to_position(&playlist->queue,
+						       playlist->current)
 			: -1;
 
-		queue_shuffle_order(&playlist.queue);
+		queue_shuffle_order(&playlist->queue);
 
 		if (current_position >= 0) {
 			/* make sure the current song is the first in
 			   the order list, so the whole rest of the
 			   playlist is played after that */
 			unsigned current_order =
-				queue_position_to_order(&playlist.queue,
+				queue_position_to_order(&playlist->queue,
 							current_position);
-			queue_swap_order(&playlist.queue, 0, current_order);
-			playlist.current = 0;
+			queue_swap_order(&playlist->queue, 0, current_order);
+			playlist->current = 0;
 		}
 	} else
-		orderPlaylist();
+		orderPlaylist(playlist);
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
 	idle_add(IDLE_OPTIONS);
 }
 
-void previousSongInPlaylist(void)
+void previousSongInPlaylist(struct playlist *playlist)
 {
 	static time_t lastTime;
 	time_t diff = time(NULL) - lastTime;
 
 	lastTime += diff;
 
-	if (!playlist.playing)
+	if (!playlist->playing)
 		return;
 
-	syncPlaylistWithQueue();
+	syncPlaylistWithQueue(playlist);
 
 	if (diff && getPlayerElapsedTime() > PLAYLIST_PREV_UNLESS_ELAPSED) {
 		/* re-start playing the current song (just like the
 		   "prev" button on CD players) */
 
-		playPlaylistOrderNumber(playlist.current);
+		playPlaylistOrderNumber(playlist, playlist->current);
 	} else {
-		if (playlist.current > 0) {
+		if (playlist->current > 0) {
 			/* play the preceding song */
-			playPlaylistOrderNumber(playlist.current - 1);
-		} else if (playlist.queue.repeat) {
+			playPlaylistOrderNumber(playlist,
+						playlist->current - 1);
+		} else if (playlist->queue.repeat) {
 			/* play the last song in "repeat" mode */
-			playPlaylistOrderNumber(queue_length(&playlist.queue) - 1);
+			playPlaylistOrderNumber(playlist,
+						queue_length(&playlist->queue) - 1);
 		} else {
 			/* re-start playing the current song if it's
 			   the first one */
-			playPlaylistOrderNumber(playlist.current);
+			playPlaylistOrderNumber(playlist, playlist->current);
 		}
 	}
 }
 
-void shufflePlaylist(void)
+void shufflePlaylist(struct playlist *playlist)
 {
 	const struct song *queued;
 	unsigned i;
 
-	if (queue_length(&playlist.queue) <= 1)
+	if (queue_length(&playlist->queue) <= 1)
 		return;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	if (playlist.playing) {
-		if (playlist.current >= 0)
+	if (playlist->playing) {
+		if (playlist->current >= 0)
 			/* put current playing song first */
-			queue_swap(&playlist.queue, 0,
-				   queue_order_to_position(&playlist.queue,
-							   playlist.current));
+			queue_swap(&playlist->queue, 0,
+				   queue_order_to_position(&playlist->queue,
+							   playlist->current));
 
-		if (playlist.queue.random) {
-			playlist.current =
-				queue_position_to_order(&playlist.queue, 0);
+		if (playlist->queue.random) {
+			playlist->current =
+				queue_position_to_order(&playlist->queue, 0);
 		} else
-			playlist.current = 0;
+			playlist->current = 0;
 
 		/* start shuffle after the current song */
 		i = 1;
 	} else {
 		/* no playback currently: shuffle everything, and
-		   reset playlist.current */
+		   reset playlist->current */
 
 		i = 0;
-		playlist.current = -1;
+		playlist->current = -1;
 	}
 
 	/* shuffle the rest of the list */
-	queue_shuffle_range(&playlist.queue, i,
-			    queue_length(&playlist.queue));
+	queue_shuffle_range(&playlist->queue, i,
+			    queue_length(&playlist->queue));
 
-	incrPlaylistVersion();
+	incrPlaylistVersion(playlist);
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 }
 
-int getPlaylistCurrentSong(void)
+int getPlaylistCurrentSong(struct playlist *playlist)
 {
-	if (playlist.current >= 0)
-		return queue_order_to_position(&playlist.queue,
-					       playlist.current);
+	if (playlist->current >= 0)
+		return queue_order_to_position(&playlist->queue,
+					       playlist->current);
 
 	return -1;
 }
 
-unsigned long getPlaylistVersion(void)
+unsigned long
+getPlaylistVersion(struct playlist *playlist)
 {
-	return playlist.queue.version;
+	return playlist->queue.version;
 }
 
-int getPlaylistLength(void)
+int
+getPlaylistLength(struct playlist *playlist)
 {
-	return queue_length(&playlist.queue);
+	return queue_length(&playlist->queue);
 }
 
-enum playlist_result seekSongInPlaylist(unsigned song, float seek_time)
+enum playlist_result
+seekSongInPlaylist(struct playlist *playlist, unsigned song, float seek_time)
 {
 	const struct song *queued;
 	unsigned i;
 	int ret;
 
-	if (!queue_valid_position(&playlist.queue, song))
+	if (!queue_valid_position(&playlist->queue, song))
 		return PLAYLIST_RESULT_BAD_RANGE;
 
-	queued = playlist_get_queued_song();
+	queued = playlist_get_queued_song(playlist);
 
-	if (playlist.queue.random)
-		i = queue_position_to_order(&playlist.queue, song);
+	if (playlist->queue.random)
+		i = queue_position_to_order(&playlist->queue, song);
 	else
 		i = song;
 
 	clearPlayerError();
-	playlist.stop_on_error = true;
-	playlist.error_count = 0;
+	playlist->stop_on_error = true;
+	playlist->error_count = 0;
 
-	if (!playlist.playing || (unsigned)playlist.current != i) {
+	if (!playlist->playing || (unsigned)playlist->current != i) {
 		/* seeking is not within the current song - first
 		   start playing the new song */
 
-		playPlaylistOrderNumber(i);
+		playPlaylistOrderNumber(playlist, i);
 		queued = NULL;
 	}
 
-	playlist_update_queued_song(queued);
+	playlist_update_queued_song(playlist, queued);
 
-	ret = playerSeek(queue_get_order(&playlist.queue, i), seek_time);
+	ret = playerSeek(queue_get_order(&playlist->queue, i), seek_time);
 	if (ret < 0)
 		return PLAYLIST_RESULT_NOT_PLAYING;
 
 	return PLAYLIST_RESULT_SUCCESS;
 }
 
-enum playlist_result seekSongInPlaylistById(unsigned id, float seek_time)
+enum playlist_result
+seekSongInPlaylistById(struct playlist *playlist, unsigned id, float seek_time)
 {
-	int song = queue_id_to_position(&playlist.queue, id);
+	int song = queue_id_to_position(&playlist->queue, id);
 	if (song < 0)
 		return PLAYLIST_RESULT_NO_SUCH_SONG;
 
-	return seekSongInPlaylist(song, seek_time);
+	return seekSongInPlaylist(playlist, song, seek_time);
 }
 
-unsigned getPlaylistSongId(unsigned song)
+unsigned
+getPlaylistSongId(struct playlist *playlist, unsigned song)
 {
-	return queue_position_to_id(&playlist.queue, song);
+	return queue_position_to_id(&playlist->queue, song);
 }