LXR linux/sound/core/seq/seq

   1/*
   2 *   ALSA sequencer Priority Queue
   3 *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
   4 *
   5 *
   6 *   This program is free software; you can redistribute it and/or modify
   7 *   it under the terms of the GNU General Public License as published by
   8 *   the Free Software Foundation; either version 2 of the License, or
   9 *   (at your option) any later version.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 *
  16 *   You should have received a copy of the GNU General Public License
  17 *   along with this program; if not, write to the Free Software
  18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19 *
  20 */
  21#ifndef __SND_SEQ_PRIOQ_H
  22#define __SND_SEQ_PRIOQ_H
  23
  24#include "seq_memory.h"
  25
  26
  27/* === PRIOQ === */
  28
  29struct snd_seq_prioq {
  30        struct snd_seq_event_cell *head;      /* pointer to head of prioq */
  31        struct snd_seq_event_cell *tail;      /* pointer to tail of prioq */
  32        int cells;
  33        spinlock_t lock;
  34};
  35
  36
  37/* create new prioq (constructor) */
  38struct snd_seq_prioq *snd_seq_prioq_new(void);
  39
  40/* delete prioq (destructor) */
  41void snd_seq_prioq_delete(struct snd_seq_prioq **fifo);
  42
  43/* enqueue cell to prioq */
  44int snd_seq_prioq_cell_in(struct snd_seq_prioq *f, struct snd_seq_event_cell *cell);
  45
  46/* dequeue cell from prioq */ 
  47struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f);
  48
  49/* return number of events available in prioq */
  50int snd_seq_prioq_avail(struct snd_seq_prioq *f);
  51
  52/* peek at cell at the head of the prioq */
  53struct snd_seq_event_cell *snd_seq_prioq_cell_peek(struct snd_seq_prioq *f);
  54
  55/* client left queue */
  56void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp);        
  57
  58/* Remove events */
  59void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client,
  60                                 struct snd_seq_remove_events *info);
  61
  62#endif
  63