Root/include/sound/util_mem.h

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 */
28struct 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 */
39struct 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 */
51struct snd_util_memhdr *snd_util_memhdr_new(int memsize);
52void snd_util_memhdr_free(struct snd_util_memhdr *hdr);
53struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
54int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
55int snd_util_mem_avail(struct snd_util_memhdr *hdr);
56
57/* functions without mutex */
58struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
59void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
60struct 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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