LXR linux/sound/core/seq/seq

   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/* init queues structure */
  67int snd_seq_queues_init(void);
  68
  69/* delete queues */ 
  70void snd_seq_queues_delete(void);
  71
  72
  73/* create new queue (constructor) */
  74int snd_seq_queue_alloc(int client, int locked, unsigned int flags);
  75
  76/* delete queue (destructor) */
  77int snd_seq_queue_delete(int client, int queueid);
  78
  79/* notification that client has left the system */
  80void snd_seq_queue_client_termination(int client);
  81
  82/* final stage */
  83void snd_seq_queue_client_leave(int client);
  84
  85/* enqueue a event received from one the clients */
  86int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
  87
  88/* Remove events */
  89void snd_seq_queue_client_leave_cells(int client);
  90void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
  91
  92/* return pointer to queue structure for specified id */
  93struct snd_seq_queue *queueptr(int queueid);
  94/* unlock */
  95#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
  96
  97/* return the (first) queue matching with the specified name */
  98struct snd_seq_queue *snd_seq_queue_find_name(char *name);
  99
 100/* check single queue and dispatch events */
 101void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
 102
 103/* access to queue's parameters */
 104int snd_seq_queue_check_access(int queueid, int client);
 105int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
 106int snd_seq_queue_set_owner(int queueid, int client, int locked);
 107int snd_seq_queue_set_locked(int queueid, int client, int locked);
 108int snd_seq_queue_timer_open(int queueid);
 109int snd_seq_queue_timer_close(int queueid);
 110int snd_seq_queue_use(int queueid, int client, int use);
 111int snd_seq_queue_is_used(int queueid, int client);
 112
 113int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
 114
 115/*
 116 * 64bit division - for sync stuff..
 117 */
 118#if defined(i386) || defined(i486)
 119
 120#define udiv_qrnnd(q, r, n1, n0, d) \
 121  __asm__ ("divl %4"            \
 122           : "=a" ((u32)(q)),   \
 123             "=d" ((u32)(r))    \
 124           : "0" ((u32)(n0)),   \
 125             "1" ((u32)(n1)),   \
 126             "rm" ((u32)(d)))
 127
 128#define u64_div(x,y,q) do {u32 __tmp; udiv_qrnnd(q, __tmp, (x)>>32, x, y);} while (0)
 129#define u64_mod(x,y,r) do {u32 __tmp; udiv_qrnnd(__tmp, q, (x)>>32, x, y);} while (0)
 130#define u64_divmod(x,y,q,r) udiv_qrnnd(q, r, (x)>>32, x, y)
 131
 132#else
 133#define u64_div(x,y,q)  ((q) = (u32)((u64)(x) / (u64)(y)))
 134#define u64_mod(x,y,r)  ((r) = (u32)((u64)(x) % (u64)(y)))
 135#define u64_divmod(x,y,q,r) (u64_div(x,y,q), u64_mod(x,y,r))
 136#endif
 137
 138
 139#endif
 140