Linux kernel mirror (for testing)
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linux
1/*
2 * ALSA sequencer Queue handling
3 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20#ifndef __SND_SEQ_QUEUE_H
21#define __SND_SEQ_QUEUE_H
22
23#include "seq_memory.h"
24#include "seq_prioq.h"
25#include "seq_timer.h"
26#include "seq_lock.h"
27#include <linux/interrupt.h>
28#include <linux/list.h>
29#include <linux/bitops.h>
30
31#define SEQ_QUEUE_NO_OWNER (-1)
32
33struct snd_seq_queue {
34 int queue; /* queue number */
35
36 char name[64]; /* name of this queue */
37
38 struct snd_seq_prioq *tickq; /* midi tick event queue */
39 struct snd_seq_prioq *timeq; /* real-time event queue */
40
41 struct snd_seq_timer *timer; /* time keeper for this queue */
42 int owner; /* client that 'owns' the timer */
43 unsigned int locked:1, /* timer is only accesibble by owner if set */
44 klocked:1, /* kernel lock (after START) */
45 check_again:1,
46 check_blocked:1;
47
48 unsigned int flags; /* status flags */
49 unsigned int info_flags; /* info for sync */
50
51 spinlock_t owner_lock;
52 spinlock_t check_lock;
53
54 /* clients which uses this queue (bitmap) */
55 DECLARE_BITMAP(clients_bitmap, SNDRV_SEQ_MAX_CLIENTS);
56 unsigned int clients; /* users of this queue */
57 struct mutex timer_mutex;
58
59 snd_use_lock_t use_lock;
60};
61
62
63/* get the number of current queues */
64int snd_seq_queue_get_cur_queues(void);
65
66/* delete queues */
67void snd_seq_queues_delete(void);
68
69
70/* create new queue (constructor) */
71struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
72
73/* delete queue (destructor) */
74int snd_seq_queue_delete(int client, int queueid);
75
76/* notification that client has left the system */
77void snd_seq_queue_client_termination(int client);
78
79/* final stage */
80void snd_seq_queue_client_leave(int client);
81
82/* enqueue a event received from one the clients */
83int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
84
85/* Remove events */
86void snd_seq_queue_client_leave_cells(int client);
87void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
88
89/* return pointer to queue structure for specified id */
90struct snd_seq_queue *queueptr(int queueid);
91/* unlock */
92#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
93
94/* return the (first) queue matching with the specified name */
95struct snd_seq_queue *snd_seq_queue_find_name(char *name);
96
97/* check single queue and dispatch events */
98void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
99
100/* access to queue's parameters */
101int snd_seq_queue_check_access(int queueid, int client);
102int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
103int snd_seq_queue_set_owner(int queueid, int client, int locked);
104int snd_seq_queue_set_locked(int queueid, int client, int locked);
105int snd_seq_queue_timer_open(int queueid);
106int snd_seq_queue_timer_close(int queueid);
107int snd_seq_queue_use(int queueid, int client, int use);
108int snd_seq_queue_is_used(int queueid, int client);
109
110int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
111
112#endif