Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
seq_fifo.h
Go to the documentation of this file.
1 /*
2  * ALSA sequencer FIFO
3  * Copyright (c) 1998 by Frank van de Pol <[email protected]>
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_FIFO_H
22 #define __SND_SEQ_FIFO_H
23 
24 #include "seq_memory.h"
25 #include "seq_lock.h"
26 
27 
28 /* === FIFO === */
29 
30 struct snd_seq_fifo {
31  struct snd_seq_pool *pool; /* FIFO pool */
32  struct snd_seq_event_cell *head; /* pointer to head of fifo */
33  struct snd_seq_event_cell *tail; /* pointer to tail of fifo */
34  int cells;
39 
40 };
41 
42 /* create new fifo (constructor) */
43 struct snd_seq_fifo *snd_seq_fifo_new(int poolsize);
44 
45 /* delete fifo (destructor) */
46 void snd_seq_fifo_delete(struct snd_seq_fifo **f);
47 
48 
49 /* enqueue event to fifo */
51 
52 /* lock fifo from release */
53 #define snd_seq_fifo_lock(fifo) snd_use_lock_use(&(fifo)->use_lock)
54 #define snd_seq_fifo_unlock(fifo) snd_use_lock_free(&(fifo)->use_lock)
55 
56 /* get a cell from fifo - fifo should be locked */
57 int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock);
58 
59 /* free dequeued cell - fifo should be locked */
61 
62 /* clean up queue */
63 void snd_seq_fifo_clear(struct snd_seq_fifo *f);
64 
65 /* polling */
67 
68 /* resize pool in fifo */
69 int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize);
70 
71 
72 #endif