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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * ALSA sequencer FIFO | |
4 | * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl> | |
1da177e4 LT |
5 | */ |
6 | #ifndef __SND_SEQ_FIFO_H | |
7 | #define __SND_SEQ_FIFO_H | |
8 | ||
9 | #include "seq_memory.h" | |
10 | #include "seq_lock.h" | |
11 | ||
12 | ||
13 | /* === FIFO === */ | |
14 | ||
c7e0b5bf TI |
15 | struct snd_seq_fifo { |
16 | struct snd_seq_pool *pool; /* FIFO pool */ | |
17 | struct snd_seq_event_cell *head; /* pointer to head of fifo */ | |
18 | struct snd_seq_event_cell *tail; /* pointer to tail of fifo */ | |
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19 | int cells; |
20 | spinlock_t lock; | |
21 | snd_use_lock_t use_lock; | |
22 | wait_queue_head_t input_sleep; | |
23 | atomic_t overflow; | |
24 | ||
c7e0b5bf | 25 | }; |
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26 | |
27 | /* create new fifo (constructor) */ | |
c7e0b5bf | 28 | struct snd_seq_fifo *snd_seq_fifo_new(int poolsize); |
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29 | |
30 | /* delete fifo (destructor) */ | |
c7e0b5bf | 31 | void snd_seq_fifo_delete(struct snd_seq_fifo **f); |
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32 | |
33 | ||
34 | /* enqueue event to fifo */ | |
c7e0b5bf | 35 | int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event); |
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36 | |
37 | /* lock fifo from release */ | |
38 | #define snd_seq_fifo_lock(fifo) snd_use_lock_use(&(fifo)->use_lock) | |
39 | #define snd_seq_fifo_unlock(fifo) snd_use_lock_free(&(fifo)->use_lock) | |
40 | ||
41 | /* get a cell from fifo - fifo should be locked */ | |
c7e0b5bf | 42 | int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock); |
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43 | |
44 | /* free dequeued cell - fifo should be locked */ | |
c7e0b5bf | 45 | void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell); |
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46 | |
47 | /* clean up queue */ | |
c7e0b5bf | 48 | void snd_seq_fifo_clear(struct snd_seq_fifo *f); |
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49 | |
50 | /* polling */ | |
c7e0b5bf | 51 | int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait); |
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52 | |
53 | /* resize pool in fifo */ | |
c7e0b5bf | 54 | int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); |
1da177e4 | 55 | |
75545304 TI |
56 | /* get the number of unused cells safely */ |
57 | int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f); | |
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58 | |
59 | #endif |