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1da177e4 LT |
1 | /* |
2 | * ALSA sequencer Memory Manager | |
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_MEMORYMGR_H | |
22 | #define __SND_SEQ_MEMORYMGR_H | |
23 | ||
24 | #include <sound/seq_kernel.h> | |
25 | #include <linux/poll.h> | |
26 | ||
1da177e4 | 27 | /* container for sequencer event (internal use) */ |
c7e0b5bf TI |
28 | struct snd_seq_event_cell { |
29 | struct snd_seq_event event; | |
30 | struct snd_seq_pool *pool; /* used pool */ | |
31 | struct snd_seq_event_cell *next; /* next cell */ | |
32 | }; | |
1da177e4 | 33 | |
d6e05edc | 34 | /* design note: the pool is a contiguous block of memory, if we dynamicly |
1da177e4 LT |
35 | want to add additional cells to the pool be better store this in another |
36 | pool as we need to know the base address of the pool when releasing | |
37 | memory. */ | |
38 | ||
c7e0b5bf TI |
39 | struct snd_seq_pool { |
40 | struct snd_seq_event_cell *ptr; /* pointer to first event chunk */ | |
41 | struct snd_seq_event_cell *free; /* pointer to the head of the free list */ | |
1da177e4 LT |
42 | |
43 | int total_elements; /* pool size actually allocated */ | |
44 | atomic_t counter; /* cells free */ | |
45 | ||
46 | int size; /* pool size to be allocated */ | |
47 | int room; /* watermark for sleep/wakeup */ | |
48 | ||
49 | int closing; | |
50 | ||
51 | /* statistics */ | |
52 | int max_used; | |
53 | int event_alloc_nopool; | |
54 | int event_alloc_failures; | |
55 | int event_alloc_success; | |
56 | ||
57 | /* Write locking */ | |
58 | wait_queue_head_t output_sleep; | |
59 | ||
60 | /* Pool lock */ | |
61 | spinlock_t lock; | |
62 | }; | |
63 | ||
c7e0b5bf | 64 | void snd_seq_cell_free(struct snd_seq_event_cell *cell); |
1da177e4 | 65 | |
c7e0b5bf TI |
66 | int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event, |
67 | struct snd_seq_event_cell **cellp, int nonblock, struct file *file); | |
1da177e4 LT |
68 | |
69 | /* return number of unused (free) cells */ | |
c7e0b5bf | 70 | static inline int snd_seq_unused_cells(struct snd_seq_pool *pool) |
1da177e4 LT |
71 | { |
72 | return pool ? pool->total_elements - atomic_read(&pool->counter) : 0; | |
73 | } | |
74 | ||
75 | /* return total number of allocated cells */ | |
c7e0b5bf | 76 | static inline int snd_seq_total_cells(struct snd_seq_pool *pool) |
1da177e4 LT |
77 | { |
78 | return pool ? pool->total_elements : 0; | |
79 | } | |
80 | ||
81 | /* init pool - allocate events */ | |
c7e0b5bf | 82 | int snd_seq_pool_init(struct snd_seq_pool *pool); |
1da177e4 LT |
83 | |
84 | /* done pool - free events */ | |
c7e0b5bf | 85 | int snd_seq_pool_done(struct snd_seq_pool *pool); |
1da177e4 LT |
86 | |
87 | /* create pool */ | |
c7e0b5bf | 88 | struct snd_seq_pool *snd_seq_pool_new(int poolsize); |
1da177e4 LT |
89 | |
90 | /* remove pool */ | |
c7e0b5bf | 91 | int snd_seq_pool_delete(struct snd_seq_pool **pool); |
1da177e4 LT |
92 | |
93 | /* init memory */ | |
94 | int snd_sequencer_memory_init(void); | |
95 | ||
96 | /* release event memory */ | |
97 | void snd_sequencer_memory_done(void); | |
98 | ||
99 | /* polling */ | |
c7e0b5bf | 100 | int snd_seq_pool_poll_wait(struct snd_seq_pool *pool, struct file *file, poll_table *wait); |
1da177e4 LT |
101 | |
102 | ||
103 | #endif |