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* ALSA sequencer Priority Queue
* Copyright (c) 1998 by Frank van de Pol <>
* 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
* 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_PRIOQ_H
#define __SND_SEQ_PRIOQ_H
#include "seq_memory.h"
/* === PRIOQ === */
struct snd_seq_prioq {
struct snd_seq_event_cell *head; /* pointer to head of prioq */
struct snd_seq_event_cell *tail; /* pointer to tail of prioq */
int cells;
spinlock_t lock;
/* create new prioq (constructor) */
struct snd_seq_prioq *snd_seq_prioq_new(void);
/* delete prioq (destructor) */
void snd_seq_prioq_delete(struct snd_seq_prioq **fifo);
/* enqueue cell to prioq */
int snd_seq_prioq_cell_in(struct snd_seq_prioq *f, struct snd_seq_event_cell *cell);
/* dequeue cell from prioq */
struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f);
/* return number of events available in prioq */
int snd_seq_prioq_avail(struct snd_seq_prioq *f);
/* peek at cell at the head of the prioq */
struct snd_seq_event_cell *snd_seq_prioq_cell_peek(struct snd_seq_prioq *f);
/* client left queue */
void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp);
/* Remove events */
void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client,
struct snd_seq_remove_events *info);