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1 | #ifndef __SOUND_UTIL_MEM_H |
2 | #define __SOUND_UTIL_MEM_H |
3 | |
4 | #include <linux/mutex.h> |
5 | /* |
6 | * Copyright (C) 2000 Takashi Iwai <tiwai@suse.de> |
7 | * |
8 | * Generic memory management routines for soundcard memory allocation |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2 of the License, or |
13 | * (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
23 | */ |
24 | |
25 | /* |
26 | * memory block |
27 | */ |
28 | struct snd_util_memblk { |
29 | unsigned int size; /* size of this block */ |
30 | unsigned int offset; /* zero-offset of this block */ |
31 | struct list_head list; /* link */ |
32 | }; |
33 | |
34 | #define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk)) |
35 | |
36 | /* |
37 | * memory management information |
38 | */ |
39 | struct snd_util_memhdr { |
40 | unsigned int size; /* size of whole data */ |
41 | struct list_head block; /* block linked-list header */ |
42 | int nblocks; /* # of allocated blocks */ |
43 | unsigned int used; /* used memory size */ |
44 | int block_extra_size; /* extra data size of chunk */ |
45 | struct mutex block_mutex; /* lock */ |
46 | }; |
47 | |
48 | /* |
49 | * prototypes |
50 | */ |
51 | struct snd_util_memhdr *snd_util_memhdr_new(int memsize); |
52 | void snd_util_memhdr_free(struct snd_util_memhdr *hdr); |
53 | struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); |
54 | int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); |
55 | int snd_util_mem_avail(struct snd_util_memhdr *hdr); |
56 | |
57 | /* functions without mutex */ |
58 | struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size); |
59 | void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk); |
60 | struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr, |
61 | unsigned int units, |
62 | struct list_head *prev); |
63 | |
64 | #endif /* __SOUND_UTIL_MEM_H */ |
65 |
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od-2011-09-04
od-2011-09-18
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