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
63
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