/* 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);

/* 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_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)

DEFINE_FREE(snd_seq_queue, struct snd_seq_queue *, if (!IS_ERR_OR_NULL(_T)) queuefree(_T))

/* 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_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