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4763ca1376
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@309 fefdeb5f-60dc-0310-8127-8f9354f1896f
88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
#ifndef foomemblockhfoo
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#define foomemblockhfoo
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <sys/types.h>
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#include <inttypes.h>
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/* A pa_memblock is a reference counted memory block. Polypaudio
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* passed references to pa_memblocks around instead of copying
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* data. See pa_memchunk for a structure that describes parts of
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* memory blocks. */
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/* The type of memory this block points to */
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enum pa_memblock_type {
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PA_MEMBLOCK_FIXED, /* data is a pointer to fixed memory that needs not to be freed */
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PA_MEMBLOCK_APPENDED, /* The most common kind: the data is appended to the memory block */
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PA_MEMBLOCK_DYNAMIC, /* data is a pointer to some memory allocated with pa_xmalloc() */
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PA_MEMBLOCK_USER /* User supplied memory, to be freed with free_cb */
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};
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/* A structure of keeping memory block statistics */
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struct pa_memblock_stat;
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struct pa_memblock {
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enum pa_memblock_type type;
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unsigned ref; /* the reference counter */
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int read_only; /* boolean */
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size_t length;
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void *data;
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void (*free_cb)(void *p); /* If type == PA_MEMBLOCK_USER this points to a function for freeing this memory block */
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struct pa_memblock_stat *stat;
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};
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/* Allocate a new memory block of type PA_MEMBLOCK_APPENDED */
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struct pa_memblock *pa_memblock_new(size_t length, struct pa_memblock_stat*s);
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/* Allocate a new memory block of type PA_MEMBLOCK_DYNAMIC. The pointer data is to be maintained be the memory block */
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struct pa_memblock *pa_memblock_new_dynamic(void *data, size_t length, struct pa_memblock_stat*s);
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/* Allocate a new memory block of type PA_MEMBLOCK_FIXED */
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struct pa_memblock *pa_memblock_new_fixed(void *data, size_t length, int read_only, struct pa_memblock_stat*s);
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/* Allocate a new memory block of type PA_MEMBLOCK_USER */
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struct pa_memblock *pa_memblock_new_user(void *data, size_t length, void (*free_cb)(void *p), int read_only, struct pa_memblock_stat*s);
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void pa_memblock_unref(struct pa_memblock*b);
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struct pa_memblock* pa_memblock_ref(struct pa_memblock*b);
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/* This special unref function has to be called by the owner of the
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memory of a static memory block when he wants to release all
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references to the memory. This causes the memory to be copied and
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converted into a PA_MEMBLOCK_DYNAMIC type memory block */
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void pa_memblock_unref_fixed(struct pa_memblock*b);
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/* Matinatins statistics about memory blocks */
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struct pa_memblock_stat {
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int ref;
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unsigned total;
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unsigned total_size;
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unsigned allocated;
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unsigned allocated_size;
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};
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struct pa_memblock_stat* pa_memblock_stat_new(void);
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void pa_memblock_stat_unref(struct pa_memblock_stat *s);
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struct pa_memblock_stat * pa_memblock_stat_ref(struct pa_memblock_stat *s);
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#endif
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