1 | #include <unistd.h>
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2 | #include <sys/types.h>
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3 | #include <cstdint>
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4 | #include <cstddef>
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5 | #include <fstream>
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6 | #include <boost/interprocess/offset_ptr.hpp>
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7 | #include <boost/interprocess/file_mapping.hpp>
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8 | #include <boost/interprocess/mapped_region.hpp>
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9 | #include <boost/interprocess/managed_external_buffer.hpp>
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10 |
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11 | const char file_name[] = "mapped_file";
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12 |
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13 | const std::size_t header_size = 16;
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14 | const std::size_t storage_size = 4096;
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15 |
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16 | // Unsigned offset type doesn't work because of incorrect casts in offset_ptr
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17 | // typedef boost::interprocess::offset_ptr< void, std::ptrdiff_t, std::uint32_t > void_pointer;
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18 | typedef boost::interprocess::offset_ptr< void, std::ptrdiff_t, std::int32_t > void_pointer;
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19 |
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20 | typedef boost::interprocess::basic_managed_external_buffer<
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21 | char,
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22 | boost::interprocess::rbtree_best_fit< boost::interprocess::null_mutex_family, void_pointer >,
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23 | boost::interprocess::iset_index
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24 | > managed_external_buffer;
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25 |
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26 | int main()
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27 | {
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28 | {
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29 | std::ofstream file(file_name, std::ios::out | std::ios::trunc | std::ios::binary);
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30 | }
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31 | truncate(file_name, header_size + storage_size);
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32 |
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33 | boost::interprocess::file_mapping file_mapping(file_name, boost::interprocess::read_write);
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34 | boost::interprocess::mapped_region file_region(file_mapping, boost::interprocess::read_write, header_size, storage_size);
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35 |
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36 | managed_external_buffer buffer(boost::interprocess::create_only, file_region.get_address(), file_region.get_size());
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37 |
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38 | return 0;
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39 | }
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