| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |