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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// SPDX-License-Identifier: BSD-2-Clause
/* Copyright (C) 2018 - 2021 Intel Corporation. */
#pragma once
#include <atomic>
#include <cstddef>
#include <exception>
#include <memory>
#include <stdexcept>
#include <string>
#include <type_traits>
#include "memkind.h"
/*
* Header file for the C++ allocator compatible with the C++ standard library
* allocator concepts. More details in pmemallocator(3) man page. Note: memory
* heap management is based on memkind_malloc, refer to the memkind(3) man page
* for more information.
*
* Functionality defined in this header is considered as stable API (STANDARD
* API). API standards are described in memkind(3) man page.
*/
namespace libmemkind
{
enum class allocation_policy
{
DEFAULT = MEMKIND_MEM_USAGE_POLICY_DEFAULT,
CONSERVATIVE = MEMKIND_MEM_USAGE_POLICY_CONSERVATIVE,
MAX
};
namespace pmem
{
namespace internal
{
class kind_wrapper_t
{
public:
kind_wrapper_t(const char *dir, std::size_t max_size,
libmemkind::allocation_policy alloc_policy =
libmemkind::allocation_policy::DEFAULT)
{
cfg = memkind_config_new();
if (!cfg) {
throw std::runtime_error(
std::string("An error occurred while creating pmem config"));
}
memkind_config_set_path(cfg, dir);
memkind_config_set_size(cfg, max_size);
memkind_config_set_memory_usage_policy(
cfg, static_cast<memkind_mem_usage_policy>(alloc_policy));
int err_c = memkind_create_pmem_with_config(cfg, &kind);
memkind_config_delete(cfg);
if (err_c == MEMKIND_ERROR_INVALID) {
throw std::invalid_argument(
std::string(
"An invalid argument was passed to create pmem kind; error code: ") +
std::to_string(err_c));
} else if (err_c) {
throw std::runtime_error(
std::string(
"An error occurred while creating pmem kind; error code: ") +
std::to_string(err_c));
}
}
kind_wrapper_t(const kind_wrapper_t &) = delete;
void operator=(const kind_wrapper_t &) = delete;
~kind_wrapper_t()
{
memkind_destroy_kind(kind);
}
memkind_t get() const
{
return kind;
}
private:
memkind_t kind;
struct memkind_config *cfg;
};
} // namespace internal
template <typename T>
class allocator
{
using kind_wrapper_t = internal::kind_wrapper_t;
std::shared_ptr<kind_wrapper_t> kind_wrapper_ptr;
public:
using value_type = T;
using pointer = value_type *;
using const_pointer = const value_type *;
using reference = value_type &;
using const_reference = const value_type &;
using size_type = size_t;
using difference_type = ptrdiff_t;
template <class U>
struct rebind {
using other = allocator<U>;
};
template <typename U>
friend class allocator;
#if !_GLIBCXX_USE_CXX11_ABI
/* This is a workaround for compilers (e.g GCC 4.8) that uses C++11
* standard, but use old - non C++11 ABI */
template <typename V = void>
explicit allocator()
{
static_assert(
std::is_same<V, void>::value,
"libmemkind::pmem::allocator cannot be compiled without CXX11 ABI");
}
#endif
explicit allocator(const char *dir, size_t max_size)
: kind_wrapper_ptr(std::make_shared<kind_wrapper_t>(dir, max_size))
{}
explicit allocator(const std::string &dir, size_t max_size)
: allocator(dir.c_str(), max_size)
{}
explicit allocator(const char *dir, size_t max_size,
libmemkind::allocation_policy alloc_policy)
: kind_wrapper_ptr(
std::make_shared<kind_wrapper_t>(dir, max_size, alloc_policy))
{}
explicit allocator(const std::string &dir, size_t max_size,
libmemkind::allocation_policy alloc_policy)
: allocator(dir.c_str(), max_size, alloc_policy)
{}
allocator(const allocator &other) = default;
template <typename U>
allocator(const allocator<U> &other) noexcept
: kind_wrapper_ptr(other.kind_wrapper_ptr)
{}
allocator(allocator &&other) = default;
template <typename U>
allocator(allocator<U> &&other) noexcept
: kind_wrapper_ptr(std::move(other.kind_wrapper_ptr))
{}
allocator<T> &operator=(const allocator &other) = default;
template <typename U>
allocator<T> &operator=(const allocator<U> &other) noexcept
{
kind_wrapper_ptr = other.kind_wrapper_ptr;
return *this;
}
allocator<T> &operator=(allocator &&other) = default;
template <typename U>
allocator<T> &operator=(allocator<U> &&other) noexcept
{
kind_wrapper_ptr = std::move(other.kind_wrapper_ptr);
return *this;
}
pointer allocate(size_type n) const
{
pointer result = static_cast<pointer>(
memkind_malloc(kind_wrapper_ptr->get(), n * sizeof(T)));
if (!result) {
throw std::bad_alloc();
}
return result;
}
void deallocate(pointer p, size_type n) const
{
memkind_free(kind_wrapper_ptr->get(), static_cast<void *>(p));
}
template <class U, class... Args>
void construct(U *p, Args &&...args) const
{
::new ((void *)p) U(std::forward<Args>(args)...);
}
void destroy(pointer p) const
{
p->~value_type();
}
template <typename U, typename V>
friend bool operator==(const allocator<U> &lhs, const allocator<V> &rhs);
template <typename U, typename V>
friend bool operator!=(const allocator<U> &lhs, const allocator<V> &rhs);
};
template <typename U, typename V>
bool operator==(const allocator<U> &lhs, const allocator<V> &rhs)
{
return lhs.kind_wrapper_ptr->get() == rhs.kind_wrapper_ptr->get();
}
template <typename U, typename V>
bool operator!=(const allocator<U> &lhs, const allocator<V> &rhs)
{
return !(lhs == rhs);
}
} // namespace pmem
} // namespace libmemkind
|
