65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
#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 */
|