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