1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#ifndef foomemblockhfoo
#define foomemblockhfoo
/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/types.h>
#include <inttypes.h>
/* A pa_memblock is a reference counted memory block. PulseAudio
* passed references to pa_memblocks around instead of copying
* data. See pa_memchunk for a structure that describes parts of
* memory blocks. */
/* The type of memory this block points to */
typedef enum pa_memblock_type {
PA_MEMBLOCK_FIXED, /* data is a pointer to fixed memory that needs not to be freed */
PA_MEMBLOCK_APPENDED, /* The most common kind: the data is appended to the memory block */
PA_MEMBLOCK_DYNAMIC, /* data is a pointer to some memory allocated with pa_xmalloc() */
PA_MEMBLOCK_USER /* User supplied memory, to be freed with free_cb */
} pa_memblock_type_t;
/* A structure of keeping memory block statistics */
/* Maintains statistics about memory blocks */
typedef struct pa_memblock_stat {
int ref;
unsigned total;
unsigned total_size;
unsigned allocated;
unsigned allocated_size;
} pa_memblock_stat;
typedef struct pa_memblock {
pa_memblock_type_t type;
unsigned ref; /* the reference counter */
int read_only; /* boolean */
size_t length;
void *data;
void (*free_cb)(void *p); /* If type == PA_MEMBLOCK_USER this points to a function for freeing this memory block */
pa_memblock_stat *stat;
} pa_memblock;
/* Allocate a new memory block of type PA_MEMBLOCK_APPENDED */
pa_memblock *pa_memblock_new(size_t length, pa_memblock_stat*s);
/* Allocate a new memory block of type PA_MEMBLOCK_DYNAMIC. The pointer data is to be maintained be the memory block */
pa_memblock *pa_memblock_new_dynamic(void *data, size_t length, pa_memblock_stat*s);
/* Allocate a new memory block of type PA_MEMBLOCK_FIXED */
pa_memblock *pa_memblock_new_fixed(void *data, size_t length, int read_only, pa_memblock_stat*s);
/* Allocate a new memory block of type PA_MEMBLOCK_USER */
pa_memblock *pa_memblock_new_user(void *data, size_t length, void (*free_cb)(void *p), int read_only, pa_memblock_stat*s);
void pa_memblock_unref(pa_memblock*b);
pa_memblock* pa_memblock_ref(pa_memblock*b);
/* This special unref function has to be called by the owner of the
memory of a static memory block when he wants to release all
references to the memory. This causes the memory to be copied and
converted into a PA_MEMBLOCK_DYNAMIC type memory block */
void pa_memblock_unref_fixed(pa_memblock*b);
pa_memblock_stat* pa_memblock_stat_new(void);
void pa_memblock_stat_unref(pa_memblock_stat *s);
pa_memblock_stat * pa_memblock_stat_ref(pa_memblock_stat *s);
#endif
|
