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1 | /* |
2 | * ALSA sequencer FIFO |
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_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; |
35 | spinlock_t lock; |
36 | snd_use_lock_t use_lock; |
37 | wait_queue_head_t input_sleep; |
38 | atomic_t overflow; |
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 */ |
50 | int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event); |
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 */ |
60 | void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell); |
61 | |
62 | /* clean up queue */ |
63 | void snd_seq_fifo_clear(struct snd_seq_fifo *f); |
64 | |
65 | /* polling */ |
66 | int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait); |
67 | |
68 | /* resize pool in fifo */ |
69 | int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); |
70 | |
71 | |
72 | #endif |
73 |
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