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