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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
#ifndef LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_
#define LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_
/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
*
* Indexlib is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation and available as file
* GPL_V2 which is distributed along with indexlib.
*
* Indexlib 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of this program with any edition of
* the TQt library by Trolltech AS, Norway (or with modified versions
* of TQt that use the same license as TQt), and distribute linked
* combinations including the two. You must obey the GNU General
* Public License in all respects for all of the code used other than
* TQt. If you modify this file, you may extend this exception to
* your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from
* your version.
*/
#include "memreference.h"
#include "manager.h"
#include "memreference.h"
#include "thing.h"
#include <cassert>
#include <vector>
#include <memory>
#include <algorithm>
#include <iostream>
/**
* @short implement memory management for things
*
* This class implements memory management for pools of things.
* It uses a simple linked list memory management algorithm and
* it depends on being supplied the right trait for the type held.
*/
template <typename Traits>
struct mempool /* : boost::noncopyable */ {
public:
typedef Traits traits_type;
typedef typename traits_type::value_type data_type;
typedef typename traits_type::pointer data_typeptr;
explicit mempool( std::auto_ptr<memory_manager> source );
/**
* Returns a memory block of size \param s.
* Analogous to malloc()
*/
data_typeptr allocate( unsigned s );
/**
* Makes the memory pointed to by \param p of size \s or allocates a new block of size \s
* and moves the held data.
*
* Analogous to realloc()
* Unlike realloc(), does not support either reallocate( 0, s ) nor reallocate( p, 0 )
*/
data_typeptr reallocate( data_typeptr, unsigned );
/** Releases the memory pointed to by \param p
* Analogous to free()
*/
void deallocate( data_typeptr p );
/** Prints a half-readable description to \param out
* Mainly for debugging
*/
void print( std::ostream& out ) const;
/**
* How big (in bytes) is the memory managed?
*/
unsigned size() const { return manager_->size(); }
private:
/**
* Basically int( log_2( min( x + 1, min_size() ) ) )
*/
static unsigned order_of( unsigned x ) {
assert( x > 0 );
if ( x < traits_type::min_size() ) x = traits_type::min_size();
--x;
unsigned res = 0;
while ( x ) {
++res;
x >>= 1;
}
return res;
}
/**
* @returns order^2
*/
static unsigned order_to_size( unsigned order ) {
return 1 << order;
}
static unsigned size_of( data_typeptr data ) {
return traits_type::size_of( data );
}
enum { min_order_for_free_node = 4 };
friend struct list_node_manager;
struct list_node_manager {
protected:
const mempool* parent_;
public:
explicit list_node_manager( const mempool* p = 0 ):parent_( p ) {}
void* rw_base( unsigned idx ) const {
return parent_->manager_->rw_base( idx );
}
const void* ronly_base( unsigned idx ) const {
return parent_->manager_->ronly_base( idx );
}
};
START_THING( list_node, thing<list_node_manager> )
void set_tqparent( const mempool* p ) { this->parent_ = p; }
MEMBER( uint16_t, order, 0 )
MEMBER( uint32_t, next, 2 )
MEMBER( uint32_t, prev, 6 )
END_THING( list_node )
list_nodeptr get_node( uint32_t p ) const;
/**
* Get the free list header for a given order
*/
memory_reference<uint32_t> free_list( unsigned order );
uint32_t free_list( unsigned order ) const {
return const_cast<mempool*>( this )->free_list( order );
}
void insert_into_list( uint32_t where, unsigned order );
void remove_from_list( uint32_t where, unsigned order );
void break_up( uint32_t where );
void init_memory();
void fill_into_list( unsigned old_size );
void fill_into_list( unsigned old_size, unsigned order );
bool join( data_typeptr&, unsigned order );
void deallocate( data_typeptr, unsigned order );
std::auto_ptr<memory_manager> manager_;
memory_reference<uint32_t> max_order_;
};
#include "mempool.tcc"
#endif /* LPC_MEMPOOL_H1103129409_INCLUDE_GUARD_ */
|
