blob: f2225e5736c73b8a14460a711c2d3411a3749b06 (
plain)
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
|
/*
* Pooling Allocator
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_POOLING_ALLOCATOR_H__
#define BOTAN_POOLING_ALLOCATOR_H__
#include <botan/allocate.h>
#include <botan/exceptn.h>
#include <mutex>
#include <utility>
#include <vector>
namespace Botan {
/**
* Pooling Allocator
*/
class Pooling_Allocator : public Allocator
{
public:
void* allocate(size_t);
void deallocate(void*, size_t);
void destroy();
Pooling_Allocator();
~Pooling_Allocator();
private:
void get_more_core(size_t);
byte* allocate_blocks(size_t);
virtual void* alloc_block(size_t) = 0;
virtual void dealloc_block(void*, size_t) = 0;
class Memory_Block
{
public:
Memory_Block(void*);
static size_t bitmap_size() { return BITMAP_SIZE; }
static size_t block_size() { return BLOCK_SIZE; }
bool contains(void*, size_t) const;
byte* alloc(size_t);
void free(void*, size_t);
bool operator<(const Memory_Block& other) const
{
if(buffer < other.buffer && other.buffer < buffer_end)
return false;
return (buffer < other.buffer);
}
private:
typedef u64bit bitmap_type;
static const size_t BITMAP_SIZE = 8 * sizeof(bitmap_type);
static const size_t BLOCK_SIZE = 64;
bitmap_type bitmap;
byte* buffer, *buffer_end;
};
std::vector<Memory_Block> blocks;
std::vector<Memory_Block>::iterator last_used;
std::vector<std::pair<void*, size_t> > allocated;
std::mutex mutex;
};
}
#endif
|
