root/sound/core/seq/seq_queue.h

INCLUDED FROM

   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         unsigned int    locked:1,       /* timer is only accesibble by owner if set */
  30                 klocked:1,      /* kernel lock (after START) */ 
  31                 check_again:1,
  32                 check_blocked:1;
  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 /* notification that client has left the system */
  63 void snd_seq_queue_client_termination(int client);
  64 
  65 /* final stage */
  66 void snd_seq_queue_client_leave(int client);
  67 
  68 /* enqueue a event received from one the clients */
  69 int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
  70 
  71 /* Remove events */
  72 void snd_seq_queue_client_leave_cells(int client);
  73 void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
  74 
  75 /* return pointer to queue structure for specified id */
  76 struct snd_seq_queue *queueptr(int queueid);
  77 /* unlock */
  78 #define queuefree(q) snd_use_lock_free(&(q)->use_lock)
  79 
  80 /* return the (first) queue matching with the specified name */
  81 struct snd_seq_queue *snd_seq_queue_find_name(char *name);
  82 
  83 /* check single queue and dispatch events */
  84 void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);
  85 
  86 /* access to queue's parameters */
  87 int snd_seq_queue_check_access(int queueid, int client);
  88 int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);
  89 int snd_seq_queue_set_owner(int queueid, int client, int locked);
  90 int snd_seq_queue_set_locked(int queueid, int client, int locked);
  91 int snd_seq_queue_timer_open(int queueid);
  92 int snd_seq_queue_timer_close(int queueid);
  93 int snd_seq_queue_use(int queueid, int client, int use);
  94 int snd_seq_queue_is_used(int queueid, int client);
  95 
  96 int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);
  97 
  98 #endif