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 */ 65