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#ifndef __SOUND_UTIL_MEM_H
#define __SOUND_UTIL_MEM_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
*/
typedef struct snd_util_memblk snd_util_memblk_t;
typedef struct snd_util_memhdr snd_util_memhdr_t;
typedef unsigned int snd_util_unit_t;
/*
* memory block
*/
struct snd_util_memblk {
snd_util_unit_t size; /* size of this block */
snd_util_unit_t offset; /* zero-offset of this block */
struct list_head list; /* link */
};
#define snd_util_memblk_argptr(blk) (void*)((char*)(blk) + sizeof(snd_util_memblk_t))
/*
* memory management information
*/
struct snd_util_memhdr {
snd_util_unit_t size; /* size of whole data */
struct list_head block; /* block linked-list header */
int nblocks; /* # of allocated blocks */
snd_util_unit_t used; /* used memory size */
int block_extra_size; /* extra data size of chunk */
struct semaphore block_mutex; /* lock */
};
/*
* prototypes
*/
snd_util_memhdr_t *snd_util_memhdr_new(int memsize);
void snd_util_memhdr_free(snd_util_memhdr_t *hdr);
snd_util_memblk_t *snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size);
int snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk);
int snd_util_mem_avail(snd_util_memhdr_t *hdr);
/* functions without mutex */
snd_util_memblk_t *__snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size);
void __snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk);
snd_util_memblk_t *__snd_util_memblk_new(snd_util_memhdr_t *hdr, snd_util_unit_t units, struct list_head *prev);
#endif /* __SOUND_UTIL_MEM_H */
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