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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2009 Chris Wilson
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#ifndef CAIRO_FREED_POOL_H
#define CAIRO_FREED_POOL_H
#include "cairoint.h"
#include "cairo-atomic-private.h"
CAIRO_BEGIN_DECLS
#define DISABLE_FREED_POOLS 0
#if HAS_ATOMIC_OPS && ! DISABLE_FREED_POOLS
/* Keep a stash of recently freed clip_paths, since we need to
* reallocate them frequently.
*/
#define MAX_FREED_POOL_SIZE 16
typedef struct {
void *pool[MAX_FREED_POOL_SIZE];
int top;
} freed_pool_t;
static cairo_always_inline void *
_atomic_fetch (void **slot)
{
void *ptr;
do {
ptr = _cairo_atomic_ptr_get (slot);
} while (! _cairo_atomic_ptr_cmpxchg (slot, ptr, NULL));
return ptr;
}
static cairo_always_inline cairo_bool_t
_atomic_store (void **slot, void *ptr)
{
return _cairo_atomic_ptr_cmpxchg (slot, NULL, ptr);
}
cairo_private void *
_freed_pool_get_search (freed_pool_t *pool);
static inline void *
_freed_pool_get (freed_pool_t *pool)
{
void *ptr;
int i;
i = pool->top - 1;
if (i < 0)
i = 0;
ptr = _atomic_fetch (&pool->pool[i]);
if (likely (ptr != NULL)) {
pool->top = i;
return ptr;
}
/* either empty or contended */
return _freed_pool_get_search (pool);
}
cairo_private void
_freed_pool_put_search (freed_pool_t *pool, void *ptr);
static inline void
_freed_pool_put (freed_pool_t *pool, void *ptr)
{
int i;
i = pool->top;
if (likely (i < ARRAY_LENGTH (pool->pool) &&
_atomic_store (&pool->pool[i], ptr)))
{
pool->top = i + 1;
return;
}
/* either full or contended */
_freed_pool_put_search (pool, ptr);
}
cairo_private void
_freed_pool_reset (freed_pool_t *pool);
#define HAS_FREED_POOL 1
#else
/* A warning about an unused freed-pool in a build without atomics
* enabled usually indicates a missing _freed_pool_reset() in the
* static reset function */
typedef int freed_pool_t;
#define _freed_pool_get(pool) NULL
#define _freed_pool_put(pool, ptr) free(ptr)
#define _freed_pool_reset(ptr)
#endif
CAIRO_END_DECLS
#endif /* CAIRO_FREED_POOL_PRIVATE_H */
|
