release/src-rt-6.x.4708/linux/linux-2.6.36/sound/core/seq/seq_prioq.h

   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
  29 struct 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) */
  38 struct snd_seq_prioq *snd_seq_prioq_new(void);
  39
  40 /* delete prioq (destructor) */
  41 void snd_seq_prioq_delete(struct snd_seq_prioq **fifo);
  42
  43 /* enqueue cell to prioq */
  44 int snd_seq_prioq_cell_in(struct snd_seq_prioq *f, struct snd_seq_event_cell *cell);
  45
  46 /* dequeue cell from prioq */
  47 struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f);
  48
  49 /* return number of events available in prioq */
  50 int snd_seq_prioq_avail(struct snd_seq_prioq *f);
  51
  52 /* peek at cell at the head of the prioq */
  53 struct snd_seq_event_cell *snd_seq_prioq_cell_peek(struct snd_seq_prioq *f);
  54
  55 /* client left queue */
  56 void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp);
  57
  58 /* Remove events */
  59 void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client,
  60                                  struct snd_seq_remove_events *info);
  61
  62 #endif