1//////////////////////////////////////////////////////////////////////////////
2//
3// (C) Copyright Ion Gaztanaga 2004-2012. Distributed under the Boost
4// Software License, Version 1.0. (See accompanying file
5// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6//
7// See http://www.boost.org/libs/interprocess for documentation.
8//
9//////////////////////////////////////////////////////////////////////////////
10
11#include <fstream>
12#include <iostream>
13#include <boost/interprocess/shared_memory_object.hpp>
14#include <boost/interprocess/mapped_region.hpp>
15#include <boost/interprocess/anonymous_shared_memory.hpp>
16#include <string>
17#include "get_process_id_name.hpp"
18
19using namespace boost::interprocess;
20
21shared_memory_object get_shared_memory_mapping()
22{
23 shared_memory_object sh;
24 return shared_memory_object(boost::move(t&: sh));
25}
26
27int main ()
28{
29 std::string process_id = test::get_process_id_name();
30 std::string process_id2(process_id);
31 process_id2 += "_2";
32 BOOST_TRY{
33 const std::size_t FileSize = 99999*4;
34 {
35 //Remove shared memory
36 shared_memory_object::remove(filename: process_id.c_str());
37 shared_memory_object::remove(filename: process_id2.c_str());
38
39 //Create shared memory and file mapping
40 shared_memory_object mapping(create_only, process_id.c_str(), read_write);
41 mapping.truncate(length: FileSize);
42 }
43
44 {
45 //Create a file mapping
46 shared_memory_object mapping(open_only, process_id.c_str(), read_write);
47
48 //Create two mapped regions, one half of the file each
49 mapped_region region (mapping
50 ,read_write
51 ,0
52 ,FileSize/2
53 ,0);
54
55 mapped_region region2(mapping
56 ,read_write
57 ,FileSize/2
58 ,FileSize - FileSize/2
59 ,0);
60
61 //Fill two regions with a pattern
62 unsigned char *filler = static_cast<unsigned char*>(region.get_address());
63 for(std::size_t i = 0
64 ;i < FileSize/2
65 ;++i){
66 *filler++ = static_cast<unsigned char>(i);
67 }
68
69 filler = static_cast<unsigned char*>(region2.get_address());
70 for(std::size_t i = FileSize/2
71 ;i < FileSize
72 ;++i){
73 *filler++ = static_cast<unsigned char>(i);
74 }
75 if(!region.flush(mapping_offset: 0, numbytes: 0, async: false)){
76 return 1;
77 }
78
79 if(!region2.flush(mapping_offset: 0, numbytes: 0, async: true)){
80 return 1;
81 }
82 }
83
84 //See if the pattern is correct in the file using two mapped regions
85 {
86 //Create a file mapping
87 shared_memory_object mapping(open_only, process_id.c_str(), read_write);
88 mapped_region region(mapping, read_write, 0, FileSize/2, 0);
89 mapped_region region2(mapping, read_write, FileSize/2, FileSize - FileSize/2, 0);
90
91 unsigned char *checker = static_cast<unsigned char*>(region.get_address());
92 //Check pattern
93 for(std::size_t i = 0
94 ;i < FileSize/2
95 ;++i){
96 if(*checker++ != static_cast<unsigned char>(i)){
97 return 1;
98 }
99 }
100
101 //Check second half
102 checker = static_cast<unsigned char *>(region2.get_address());
103
104 //Check pattern
105 for(std::size_t i = FileSize/2
106 ;i < FileSize
107 ;++i){
108 if(*checker++ != static_cast<unsigned char>(i)){
109 return 1;
110 }
111 }
112 }
113 #ifdef BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES
114 //Now check the pattern mapping a single read only mapped_region
115 {
116 //Create a file mapping
117 shared_memory_object mapping(open_only, test::get_process_id_wname(), read_only);
118
119 //Create a single regions, mapping all the file
120 mapped_region region (mapping, read_only);
121
122 //Check pattern
123 unsigned char *pattern = static_cast<unsigned char*>(region.get_address());
124 for(std::size_t i = 0
125 ;i < FileSize
126 ;++i, ++pattern){
127 if(*pattern != static_cast<unsigned char>(i)){
128 return 1;
129 }
130 }
131 }
132 #endif //BOOST_INTERPROCESS_WCHAR_NAMED_RESOURCES
133 //Now check the pattern mapping a single read only mapped_region
134 {
135 //Create a file mapping
136 shared_memory_object mapping(open_only, process_id.c_str(), read_only);
137
138 //Create a single regions, mapping all the file
139 mapped_region region (mapping, read_only);
140
141 //Check pattern
142 unsigned char *pattern = static_cast<unsigned char*>(region.get_address());
143 for(std::size_t i = 0
144 ;i < FileSize
145 ;++i, ++pattern){
146 if(*pattern != static_cast<unsigned char>(i)){
147 return 1;
148 }
149 }
150 //Now shrink
151 const std::size_t original_region_size = region.get_size();
152 if(!region.shrink_by(bytes: region.get_size()/2, from_back: false) || region.get_size() != original_region_size/2){
153 return 1;
154 }
155 const std::size_t shrunk_region_size = region.get_size();
156 if(!region.shrink_by(bytes: region.get_size()/2, from_back: true) || region.get_size() != shrunk_region_size/2){
157 return 1;
158 }
159
160 //Now advise
161 #if defined(POSIX_MADV_NORMAL) || defined(MADV_NORMAL)
162 std::cout << "Advice normal" << std::endl;
163 if(!region.advise(advice: mapped_region::advice_normal)){
164 return 1;
165 }
166 #endif
167
168 #if defined(POSIX_MADV_SEQUENTIAL) || defined(MADV_SEQUENTIAL)
169 std::cout << "Advice sequential" << std::endl;
170 if(!region.advise(advice: mapped_region::advice_sequential)){
171 return 1;
172 }
173 #endif
174
175 #if defined(POSIX_MADV_RANDOM) || defined(MADV_RANDOM)
176 std::cout << "Advice random" << std::endl;
177 if(!region.advise(advice: mapped_region::advice_random)){
178 return 1;
179 }
180 #endif
181
182 #if defined(POSIX_MADV_WILLNEED) || defined(MADV_WILLNEED)
183 std::cout << "Advice 'will need'" << std::endl;
184 if(!region.advise(advice: mapped_region::advice_willneed)){
185 return 1;
186 }
187 #endif
188
189 #if defined(POSIX_MADV_DONTNEED) || (defined(MADV_DONTNEED) && defined(BOOST_INTERPROCESS_MADV_DONTNEED_HAS_NONDESTRUCTIVE_SEMANTICS))
190 std::cout << "Advice 'dont't need'" << std::endl;
191 if(!region.advise(advice: mapped_region::advice_dontneed)){
192 return 1;
193 }
194 #endif
195
196 }
197 {
198 //Check for busy address space
199 shared_memory_object mapping(open_only, process_id.c_str(), read_only);
200 mapped_region region (mapping, read_only);
201 shared_memory_object mapping2(create_only, process_id2.c_str(), read_write);
202 mapping2.truncate(length: FileSize);
203 BOOST_TRY{
204 mapped_region region2 (mapping2, read_only, 0, FileSize, region.get_address());
205 }
206 BOOST_CATCH(interprocess_exception &e){
207 shared_memory_object::remove(filename: process_id2.c_str());
208 if(e.get_error_code() != busy_error){
209 throw e;
210 }
211 }
212 BOOST_CATCH(std::exception &){
213 shared_memory_object::remove(filename: process_id2.c_str());
214 BOOST_RETHROW
215 } BOOST_CATCH_END
216 shared_memory_object::remove(filename: process_id2.c_str());
217 }
218 {
219 //Now check anonymous mapping
220 mapped_region region(anonymous_shared_memory(size: FileSize));
221
222 //Write pattern
223 unsigned char *pattern = static_cast<unsigned char*>(region.get_address());
224 for(std::size_t i = 0
225 ;i < FileSize
226 ;++i, ++pattern){
227 *pattern = static_cast<unsigned char>(i);
228 }
229
230 //Check pattern
231 pattern = static_cast<unsigned char*>(region.get_address());
232 for(std::size_t i = 0
233 ;i < FileSize
234 ;++i, ++pattern){
235 if(*pattern != static_cast<unsigned char>(i)){
236 return 1;
237 }
238 }
239 }
240 {
241 //Now test move semantics
242 shared_memory_object mapping(open_only, process_id.c_str(), read_write);
243 shared_memory_object move_ctor(boost::move(t&: mapping));
244 shared_memory_object move_assign;
245 move_assign = boost::move(t&: move_ctor);
246 shared_memory_object ret(get_shared_memory_mapping());
247 }
248 }
249 BOOST_CATCH(std::exception &exc){
250 shared_memory_object::remove(filename: process_id.c_str());
251 shared_memory_object::remove(filename: process_id2.c_str());
252 std::cout << "Unhandled exception: " << exc.what() << std::endl;
253 return 1;
254 } BOOST_CATCH_END
255 shared_memory_object::remove(filename: process_id.c_str());
256 return 0;
257}
258

source code of boost/libs/interprocess/test/shared_memory_mapping_test.cpp