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/*
* ALSA sequencer Queue handling
* Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#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 */
prioq_t *tickq; /* midi tick event queue */
prioq_t *timeq; /* real-time event queue */
seq_timer_t *timer; /* time keeper for this queue */
int owner; /* client that 'owns' the timer */
unsigned int locked:1, /* timer is only accesibble by owner if set */
klocked:1, /* kernel lock (after START) */
check_again:1,
check_blocked:1;
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 semaphore timer_mutex;
snd_use_lock_t use_lock;
};
/* get the number of current queues */
int snd_seq_queue_get_cur_queues(void);
/* init queues structure */
int snd_seq_queues_init(void);
/* delete queues */
void snd_seq_queues_delete(void);
/* create new queue (constructor) */
int snd_seq_queue_alloc(int client, int locked, unsigned int flags);
/* delete queue (destructor) */
int snd_seq_queue_delete(int client, int queueid);
/* notification that client has left the system */
void snd_seq_queue_client_termination(int client);
/* final stage */
void snd_seq_queue_client_leave(int client);
/* enqueue a event received from one the clients */
int snd_seq_enqueue_event(snd_seq_event_cell_t *cell, int atomic, int hop);
/* Remove events */
void snd_seq_queue_client_leave_cells(int client);
void snd_seq_queue_remove_cells(int client, snd_seq_remove_events_t *info);
/* return pointer to queue structure for specified id */
queue_t *queueptr(int queueid);
/* unlock */
#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
/* return the (first) queue matching with the specified name */
queue_t *snd_seq_queue_find_name(char *name);
/* check single queue and dispatch events */
void snd_seq_check_queue(queue_t *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, snd_seq_queue_tempo_t *info);
int snd_seq_queue_set_owner(int queueid, int client, int locked);
int snd_seq_queue_set_locked(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(snd_seq_event_t *ev, int atomic, int hop);
void snd_seq_queue_process_event(queue_t *q, snd_seq_event_t *ev, int atomic, int hop);
/*
* 64bit division - for sync stuff..
*/
#if defined(i386) || defined(i486)
#define udiv_qrnnd(q, r, n1, n0, d) \
__asm__ ("divl %4" \
: "=a" ((u32)(q)), \
"=d" ((u32)(r)) \
: "0" ((u32)(n0)), \
"1" ((u32)(n1)), \
"rm" ((u32)(d)))
#define u64_div(x,y,q) do {u32 __tmp; udiv_qrnnd(q, __tmp, (x)>>32, x, y);} while (0)
#define u64_mod(x,y,r) do {u32 __tmp; udiv_qrnnd(__tmp, q, (x)>>32, x, y);} while (0)
#define u64_divmod(x,y,q,r) udiv_qrnnd(q, r, (x)>>32, x, y)
#else
#define u64_div(x,y,q) ((q) = (u32)((u64)(x) / (u64)(y)))
#define u64_mod(x,y,r) ((r) = (u32)((u64)(x) % (u64)(y)))
#define u64_divmod(x,y,q,r) (u64_div(x,y,q), u64_mod(x,y,r))
#endif
#endif
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