1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * ALSA sequencer Queue handling
4 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
5 */
6#ifndef __SND_SEQ_QUEUE_H
7#define __SND_SEQ_QUEUE_H
8
9#include "seq_memory.h"
10#include "seq_prioq.h"
11#include "seq_timer.h"
12#include "seq_lock.h"
13#include <linux/interrupt.h>
14#include <linux/list.h>
15#include <linux/bitops.h>
16
17#define SEQ_QUEUE_NO_OWNER (-1)
18
19struct snd_seq_queue {
20 int queue; /* queue number */
21
22 char name[64]; /* name of this queue */
23
24 struct snd_seq_prioq *tickq; /* midi tick event queue */
25 struct snd_seq_prioq *timeq; /* real-time event queue */
26
27 struct snd_seq_timer *timer; /* time keeper for this queue */
28 int owner; /* client that 'owns' the timer */
29 bool locked; /* timer is only accesibble by owner if set */
30 bool klocked; /* kernel lock (after START) */
31 bool check_again; /* concurrent access happened during check */
32 bool check_blocked; /* queue being checked */
33
34 unsigned int flags; /* status flags */
35 unsigned int info_flags; /* info for sync */
36
37 spinlock_t owner_lock;
38 spinlock_t check_lock;
39
40 /* clients which uses this queue (bitmap) */
41 DECLARE_BITMAP(clients_bitmap, SNDRV_SEQ_MAX_CLIENTS);
42 unsigned int clients; /* users of this queue */
43 struct mutex timer_mutex;
44
45 snd_use_lock_t use_lock;
46};
47
48
49/* get the number of current queues */
50int snd_seq_queue_get_cur_queues(void);
51
52/* delete queues */
53void snd_seq_queues_delete(void);
54
55
56/* create new queue (constructor) */
57struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
58
59/* delete queue (destructor) */
60int snd_seq_queue_delete(int client, int queueid);
61
62/* final stage */
63void snd_seq_queue_client_leave(int client);
64
65/* enqueue a event received from one the clients */
66int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
67
68/* Remove events */
69void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
70
71/* return pointer to queue structure for specified id */
72struct snd_seq_queue *queueptr(int queueid);
73/* unlock */
74#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
75
76DEFINE_FREE(snd_seq_queue, struct snd_seq_queue *, if (!IS_ERR_OR_NULL(_T)) queuefree(_T))
77
78/* return the (first) queue matching with the specified name */
79struct snd_seq_queue *snd_seq_queue_find_name(char *name);
80
81/* check single queue and dispatch events */
82void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
83
84/* access to queue's parameters */
85int snd_seq_queue_check_access(int queueid, int client);
86int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
87int snd_seq_queue_set_owner(int queueid, int client, int locked);
88int snd_seq_queue_timer_open(int queueid);
89int snd_seq_queue_timer_close(int queueid);
90int snd_seq_queue_use(int queueid, int client, int use);
91int snd_seq_queue_is_used(int queueid, int client);
92
93int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
94
95#endif
96

source code of linux/sound/core/seq/seq_queue.h