LXR linux/sound/core/seq/seq

   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_client_leave_cells(int client);
  70void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
  71
  72/* return pointer to queue structure for specified id */
  73struct 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 */
  78struct snd_seq_queue *snd_seq_queue_find_name(char *name);
  79
  80/* check single queue and dispatch events */
  81void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
  82
  83/* access to queue's parameters */
  84int snd_seq_queue_check_access(int queueid, int client);
  85int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
  86int snd_seq_queue_set_owner(int queueid, int client, int locked);
  87int snd_seq_queue_set_locked(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