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_8hpp_source.html | 169 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+) create mode 100644 shmem_8hpp_source.html (limited to 'shmem_8hpp_source.html') diff --git a/shmem_8hpp_source.html b/shmem_8hpp_source.html new file mode 100644 index 0000000..c885195 --- /dev/null +++ b/shmem_8hpp_source.html @@ -0,0 +1,169 @@ + + + + + + + +winapi_common: include/winapi/shmem.hpp Source File + + + + + + + + + +
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winapi_common +
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shmem.hpp
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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 #pragma once
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7 
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8 #include "handle.hpp"
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9 
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10 #include <cstddef>
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11 #include <memory>
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12 #include <string>
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13 #include <type_traits>
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14 #include <utility>
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15 
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16 namespace winapi {
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17 
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19 class SharedMemory {
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20 public:
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26  static SharedMemory create(const std::string& name, std::size_t nb);
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31  static SharedMemory open(const std::string& name);
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32 
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34  void* get() const { return m_addr.get(); }
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36  void* ptr() const { return get(); }
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37 
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38 private:
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39  struct Unmap {
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40  void operator()(void*) const;
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41  };
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42 
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43  SharedMemory() = default;
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44 
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45  SharedMemory(Handle&& handle, void* addr) : m_handle{std::move(handle)}, m_addr{addr} {}
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46 
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47  Handle m_handle;
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48  std::unique_ptr<void, Unmap> m_addr;
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49 };
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50 
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52 template <typename T>
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53 class SharedObject {
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54 public:
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55  typedef typename std::aligned_storage<sizeof(T), __alignof(T)>::type AlignedType;
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56 
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62  template <typename... Args>
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63  static SharedObject create(const std::string& name, Args&&... args) {
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64  SharedObject obj{SharedMemory::create(name, sizeof(AlignedType))};
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65  new (obj.ptr()) T(std::forward<Args>(args)...);
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66  obj.m_destruct = true;
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67  return obj;
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68  }
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69 
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74  static SharedObject open(const std::string& name) {
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75  SharedObject obj{SharedMemory::open(name)};
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76  return obj;
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77  }
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78 
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79  SharedObject(SharedObject&& other) noexcept = default;
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80  SharedObject& operator=(const SharedObject& other) noexcept = default;
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81  SharedObject(const SharedObject&) = delete;
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82 
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83  ~SharedObject() {
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84  if (m_destruct && ptr()) {
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85  ptr()->~T();
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86  }
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87  }
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88 
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90  T* ptr() const { return reinterpret_cast<T*>(m_shmem.ptr()); }
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92  T& get() const { return *ptr(); }
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93 
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94  T* operator->() const { return ptr(); }
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95  T& operator*() const { return get(); }
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96 
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97 private:
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98  explicit SharedObject(SharedMemory&& shmem) : m_shmem(std::move(shmem)) {}
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99 
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100  SharedMemory m_shmem;
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101  // Destruct only once, no matter the number of mappings.
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102  bool m_destruct = false;
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103 };
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104 
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105 } // namespace winapi
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winapi::SharedMemory
Named shared memory region.
Definition: shmem.hpp:19
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winapi::SharedMemory::ptr
void * ptr() const
Definition: shmem.hpp:36
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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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winapi::SharedMemory::get
void * get() const
Definition: shmem.hpp:34
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winapi::SharedObject
Easy way to represent a C++ object as a shared memory region.
Definition: shmem.hpp:53
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winapi::SharedObject::open
static SharedObject open(const std::string &name)
Definition: shmem.hpp:74
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winapi::SharedObject::ptr
T * ptr() const
Definition: shmem.hpp:90
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winapi::SharedObject::get
T & get() const
Definition: shmem.hpp:92
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winapi::SharedObject::create
static SharedObject create(const std::string &name, Args &&... args)
Definition: shmem.hpp:63
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