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
|
/*
* Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "Model.h"
#include <cwrap/Fildes.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>
namespace
{
class MemoryMappedModel final : public ModelData
{
public:
/**
* @require fd and data SHOULD be valid
*/
explicit MemoryMappedModel(int fd, void *data, size_t size) : _fd{fd}, _data{data}, _size{size}
{
// DO NOTHING
}
public:
~MemoryMappedModel()
{
munmap(_data, _size);
close(_fd);
}
public:
MemoryMappedModel(const MemoryMappedModel &) = delete;
MemoryMappedModel(MemoryMappedModel &&) = delete;
public:
const void *data(void) const override { return _data; };
const size_t size(void) const override { return _size; };
private:
int _fd = -1;
void *_data = nullptr;
size_t _size = 0;
};
} // namespace
std::unique_ptr<ModelData> load_modeldata(const std::string &path)
{
cwrap::Fildes fd(open(path.c_str(), O_RDONLY));
if (fd.get() == -1)
{
// Return nullptr on open failure
return nullptr;
}
struct stat st;
if (fstat(fd.get(), &st) == -1)
{
// Return nullptr on fstat failure
return nullptr;
}
auto size = st.st_size;
auto data = mmap(nullptr, size, PROT_READ, MAP_SHARED, fd.get(), 0);
if (data == MAP_FAILED)
{
// Return nullptr on mmap failure
return nullptr;
}
return std::unique_ptr<ModelData>{new MemoryMappedModel(fd.release(), data, size)};
}
|
