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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596/* SPDX-License-Identifier: GPL-2.0-or-later *//* * ALSA sequencer Queue handling * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> */#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 */
struct snd_seq_prioq *tickq; /* midi tick event queue */ struct snd_seq_prioq *timeq; /* real-time event queue */ struct snd_seq_timer *timer; /* time keeper for this queue */ int owner; /* client that 'owns' the timer */ bool locked; /* timer is only accesibble by owner if set */ bool klocked; /* kernel lock (after START) */ bool check_again; /* concurrent access happened during check */ bool check_blocked; /* queue being checked */
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 mutex timer_mutex;
snd_use_lock_t use_lock;};
/* get the number of current queues */int snd_seq_queue_get_cur_queues(void);
/* delete queues */ void snd_seq_queues_delete(void);
/* create new queue (constructor) */struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);
/* delete queue (destructor) */int snd_seq_queue_delete(int client, int queueid);
/* final stage */void snd_seq_queue_client_leave(int client);
/* enqueue a event received from one the clients */int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);
/* Remove events */void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);
/* return pointer to queue structure for specified id */struct snd_seq_queue *queueptr(int queueid);/* unlock */#define queuefree(q) snd_use_lock_free(&(q)->use_lock)
DEFINE_FREE(snd_seq_queue, struct snd_seq_queue *, if (!IS_ERR_OR_NULL(_T)) queuefree(_T))
/* return the (first) queue matching with the specified name */struct snd_seq_queue *snd_seq_queue_find_name(char *name);
/* check single queue and dispatch events */void snd_seq_check_queue(struct snd_seq_queue *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, struct snd_seq_queue_tempo *info);int snd_seq_queue_set_owner(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(struct snd_seq_event *ev, int atomic, int hop);
#endif