1 files changed, 98 insertions, 0 deletions
diff --git a/sound/core/seq/seq_queue.h b/sound/core/seq/seq_queue.h
new file mode 100644
index 000000000..25d2d6b61
--- /dev/null
+++ b/sound/core/seq/seq_queue.h
@@ -0,0 +1,98 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   ALSA sequencer Queue handling
+ *   Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
+ */
+#ifndef __SND_SEQ_QUEUE_H
+#define __SND_SEQ_QUEUE_H
+
+#include "seq_memory.h"
+#include "seq_prioq.h"
+#include "seq_timer.h"
+#include "seq_lock.h"
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/bitops.h>
+
+#define SEQ_QUEUE_NO_OWNER (-1)
+
+struct snd_seq_queue {
+	int queue;		/* queue number */
+
+	char name[64];		/* name of this queue */
+
+	struct snd_seq_prioq	*tickq;		/* midi tick event queue */
+	struct snd_seq_prioq	*timeq;		/* real-time event queue */	
+	
+	struct snd_seq_timer *timer;	/* time keeper for this queue */
+	int	owner;		/* client that 'owns' the timer */
+	bool	locked;		/* timer is only accesibble by owner if set */
+	bool	klocked;	/* kernel lock (after START) */
+	bool	check_again;	/* concurrent access happened during check */
+	bool	check_blocked;	/* queue being checked */
+
+	unsigned int flags;		/* status flags */
+	unsigned int info_flags;	/* info for sync */
+
+	spinlock_t owner_lock;
+	spinlock_t check_lock;
+
+	/* clients which uses this queue (bitmap) */
+	DECLARE_BITMAP(clients_bitmap, SNDRV_SEQ_MAX_CLIENTS);
+	unsigned int clients;	/* users of this queue */
+	struct mutex timer_mutex;
+
+	snd_use_lock_t use_lock;
+};
+
+
+/* get the number of current queues */
+int snd_seq_queue_get_cur_queues(void);
+
+/* delete queues */ 
+void snd_seq_queues_delete(void);
+
+
+/* create new queue (constructor) */
+struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
+
+/* delete queue (destructor) */
+int snd_seq_queue_delete(int client, int queueid);
+
+/* notification that client has left the system */
+void snd_seq_queue_client_termination(int client);
+
+/* final stage */
+void snd_seq_queue_client_leave(int client);
+
+/* enqueue a event received from one the clients */
+int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
+
+/* Remove events */
+void snd_seq_queue_client_leave_cells(int client);
+void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
+
+/* return pointer to queue structure for specified id */
+struct snd_seq_queue *queueptr(int queueid);
+/* unlock */
+#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
+
+/* return the (first) queue matching with the specified name */
+struct snd_seq_queue *snd_seq_queue_find_name(char *name);
+
+/* check single queue and dispatch events */
+void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
+
+/* access to queue's parameters */
+int snd_seq_queue_check_access(int queueid, int client);
+int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
+int snd_seq_queue_set_owner(int queueid, int client, int locked);
+int snd_seq_queue_set_locked(int queueid, int client, int locked);
+int snd_seq_queue_timer_open(int queueid);
+int snd_seq_queue_timer_close(int queueid);
+int snd_seq_queue_use(int queueid, int client, int use);
+int snd_seq_queue_is_used(int queueid, int client);
+
+int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
+
+#endif