Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 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 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 40 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | /* create new fifo (constructor) */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 43 | struct snd_seq_fifo *snd_seq_fifo_new(int poolsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* delete fifo (destructor) */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 46 | void snd_seq_fifo_delete(struct snd_seq_fifo **f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | |
| 49 | /* enqueue event to fifo */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 50 | int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 57 | int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | /* free dequeued cell - fifo should be locked */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 60 | void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | /* clean up queue */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 63 | void snd_seq_fifo_clear(struct snd_seq_fifo *f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | /* polling */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 66 | int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* resize pool in fifo */ |
Takashi Iwai | c7e0b5b | 2005-11-17 14:04:02 +0100 | [diff] [blame] | 69 | int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | |
| 72 | #endif |