From def5c50960eea4c112647f88361a3ae7155901a8 Mon Sep 17 00:00:00 2001 From: egor-tensin Date: Tue, 4 Jul 2023 00:48:00 +0000 Subject: =?UTF-8?q?Deploying=20to=20gh-pages=20from=20@=20egor-tensin/wina?= =?UTF-8?q?pi-common@0c196cbe8b4927c78c02b2c7312fc69a507db845=20?= =?UTF-8?q?=F0=9F=9A=80?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- shmem_8cpp_source.html | 154 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 shmem_8cpp_source.html (limited to 'shmem_8cpp_source.html') diff --git a/shmem_8cpp_source.html b/shmem_8cpp_source.html new file mode 100644 index 0000000..8805185 --- /dev/null +++ b/shmem_8cpp_source.html @@ -0,0 +1,154 @@ + + + + + + + +winapi_common: src/shmem.cpp Source File + + + + + + + + + +
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winapi_common +
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shmem.cpp
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1 // Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
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2 // This file is part of the "winapi-common" project.
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3 // For details, see https://github.com/egor-tensin/winapi-common.
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4 // Distributed under the MIT License.
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5 
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6 #include <winapi/error.hpp>
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7 #include <winapi/handle.hpp>
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8 #include <winapi/shmem.hpp>
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9 #include <winapi/utf8.hpp>
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10 #include <winapi/utils.hpp>
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11 
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12 #include <windows.h>
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13 
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14 #include <cstddef>
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15 #include <cstdint>
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16 #include <string>
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17 #include <utility>
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18 
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19 namespace winapi {
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20 namespace {
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21 
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22 void* do_map(const Handle& mapping, std::size_t nb = 0) {
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23  const auto addr = ::MapViewOfFile(static_cast<HANDLE>(mapping), FILE_MAP_ALL_ACCESS, 0, 0, nb);
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24 
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25  if (addr == NULL) {
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26  throw error::windows(GetLastError(), "MapViewOfFile");
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27  }
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28 
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29  return addr;
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30 }
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31 
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32 } // namespace
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33 
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34 void SharedMemory::Unmap::operator()(void* ptr) const {
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35  const auto ret = ::UnmapViewOfFile(ptr);
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36  assert(ret);
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37  WINAPI_UNUSED_PARAMETER(ret);
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38 };
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39 
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40 SharedMemory SharedMemory::create(const std::string& name, std::size_t nb) {
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41  const auto nb64 = static_cast<std::uint64_t>(nb);
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42  static_assert(sizeof(nb64) == 2 * sizeof(DWORD), "sizeof(DWORD) != 32");
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43 
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44  const auto nb_low = static_cast<DWORD>(nb64);
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45  const auto nb_high = static_cast<DWORD>(nb64 >> 32);
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46 
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47  const auto mapping_impl = ::CreateFileMappingW(
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48  INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, nb_high, nb_low, widen(name).c_str());
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49 
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50  if (mapping_impl == NULL) {
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51  throw error::windows(GetLastError(), "CreateFileMappingW");
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52  }
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53 
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54  Handle mapping{mapping_impl};
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55  const auto addr = do_map(mapping);
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56  return {std::move(mapping), addr};
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57 }
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58 
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59 SharedMemory SharedMemory::open(const std::string& name) {
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60  const auto mapping_impl = ::OpenFileMappingW(FILE_MAP_ALL_ACCESS, FALSE, widen(name).c_str());
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61 
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62  if (mapping_impl == NULL) {
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63  throw error::windows(GetLastError(), "OpenFileMappingW");
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64  }
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65 
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66  Handle mapping{mapping_impl};
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67  const auto addr = do_map(mapping);
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68  return {std::move(mapping), addr};
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69 }
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70 
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71 } // namespace winapi
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winapi::Handle
HANDLE wrapper.
Definition: handle.hpp:25
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winapi::SharedMemory
Named shared memory region.
Definition: shmem.hpp:19
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winapi::SharedMemory::create
static SharedMemory create(const std::string &name, std::size_t nb)
Definition: shmem.cpp:40
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winapi::SharedMemory::open
static SharedMemory open(const std::string &name)
Definition: shmem.cpp:59
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error.hpp
Make std::system_error work with GetLastError().
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