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 
19 struct 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 */
50 int snd_seq_queue_get_cur_queues(void);
51 
52 /* delete queues */
53 void snd_seq_queues_delete(void);
54 
55 
56 /* create new queue (constructor) */
57 struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
58 
59 /* delete queue (destructor) */
60 int snd_seq_queue_delete(int client, int queueid);
61 
62 /* final stage */
63 void snd_seq_queue_client_leave(int client);
64 
65 /* enqueue a event received from one the clients */
66 int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
67 
68 /* Remove events */
69 void snd_seq_queue_client_leave_cells(int client);
70 void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
71 
72 /* return pointer to queue structure for specified id */
73 struct snd_seq_queue *queueptr(int queueid);
74 /* unlock */
75 #define queuefree(q) snd_use_lock_free(&(q)->use_lock)
76 
77 /* return the (first) queue matching with the specified name */
78 struct snd_seq_queue *snd_seq_queue_find_name(char *name);
79 
80 /* check single queue and dispatch events */
81 void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
82 
83 /* access to queue's parameters */
84 int snd_seq_queue_check_access(int queueid, int client);
85 int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
86 int snd_seq_queue_set_owner(int queueid, int client, int locked);
87 int snd_seq_queue_set_locked(int queueid, int client, int locked);
88 int snd_seq_queue_timer_open(int queueid);
89 int snd_seq_queue_timer_close(int queueid);
90 int snd_seq_queue_use(int queueid, int client, int use);
91 int snd_seq_queue_is_used(int queueid, int client);
92 
93 int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
94 
95 #endif
96