60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||
|
|
/*
|
||
|
|
* ALSA sequencer FIFO
|
||
|
|
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
|
||
|
|
*/
|
||
|
|
#ifndef __SND_SEQ_FIFO_H
|
||
|
|
#define __SND_SEQ_FIFO_H
|
||
|
|
|
||
|
|
#include "seq_memory.h"
|
||
|
|
#include "seq_lock.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* === FIFO === */
|
||
|
|
|
||
|
|
struct snd_seq_fifo {
|
||
|
|
struct snd_seq_pool *pool; /* FIFO pool */
|
||
|
|
struct snd_seq_event_cell *head; /* pointer to head of fifo */
|
||
|
|
struct snd_seq_event_cell *tail; /* pointer to tail of fifo */
|
||
|
|
int cells;
|
||
|
|
spinlock_t lock;
|
||
|
|
snd_use_lock_t use_lock;
|
||
|
|
wait_queue_head_t input_sleep;
|
||
|
|
atomic_t overflow;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
/* create new fifo (constructor) */
|
||
|
|
struct snd_seq_fifo *snd_seq_fifo_new(int poolsize);
|
||
|
|
|
||
|
|
/* delete fifo (destructor) */
|
||
|
|
void snd_seq_fifo_delete(struct snd_seq_fifo **f);
|
||
|
|
|
||
|
|
|
||
|
|
/* enqueue event to fifo */
|
||
|
|
int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event);
|
||
|
|
|
||
|
|
/* lock fifo from release */
|
||
|
|
#define snd_seq_fifo_lock(fifo) snd_use_lock_use(&(fifo)->use_lock)
|
||
|
|
#define snd_seq_fifo_unlock(fifo) snd_use_lock_free(&(fifo)->use_lock)
|
||
|
|
|
||
|
|
/* get a cell from fifo - fifo should be locked */
|
||
|
|
int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock);
|
||
|
|
|
||
|
|
/* free dequeued cell - fifo should be locked */
|
||
|
|
void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell);
|
||
|
|
|
||
|
|
/* clean up queue */
|
||
|
|
void snd_seq_fifo_clear(struct snd_seq_fifo *f);
|
||
|
|
|
||
|
|
/* polling */
|
||
|
|
int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait);
|
||
|
|
|
||
|
|
/* resize pool in fifo */
|
||
|
|
int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize);
|
||
|
|
|
||
|
|
/* get the number of unused cells safely */
|
||
|
|
int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f);
|
||
|
|
|
||
|
|
#endif
|