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/* SPDX-License-Identifier: GPL-2.0-or-later */
* ALSA sequencer Queue handling
* Copyright (c) 1998-1999 by Frank van de Pol <>
#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) */
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);
/* 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);