util_mem.h
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#ifndef __SOUND_UTIL_MEM_H
#define __SOUND_UTIL_MEM_H
#include <linux/mutex.h>
/*
* Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
*
* Generic memory management routines for soundcard memory allocation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* memory block
*/
struct snd_util_memblk {
unsigned int size; /* size of this block */
unsigned int offset; /* zero-offset of this block */
struct list_head list; /* link */
};
#define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(struct snd_util_memblk))
/*
* memory management information
*/
struct snd_util_memhdr {
unsigned int size; /* size of whole data */
struct list_head block; /* block linked-list header */
int nblocks; /* # of allocated blocks */
unsigned int used; /* used memory size */
int block_extra_size; /* extra data size of chunk */
struct mutex block_mutex; /* lock */
};
/*
* prototypes
*/
struct snd_util_memhdr *snd_util_memhdr_new(int memsize);
void snd_util_memhdr_free(struct snd_util_memhdr *hdr);
struct snd_util_memblk *snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
int snd_util_mem_avail(struct snd_util_memhdr *hdr);
/* functions without mutex */
struct snd_util_memblk *__snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size);
void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk);
struct snd_util_memblk *__snd_util_memblk_new(struct snd_util_memhdr *hdr,
unsigned int units,
struct list_head *prev);
#endif /* __SOUND_UTIL_MEM_H */