// // SharedMemoryImpl.h // // Library: Foundation // Package: Processes // Module: SharedMemoryImpl // // Definition of the SharedMemoryImpl class. // // Copyright (c) 2007, Applied Informatics Software Engineering GmbH. // and Contributors. // // SPDX-License-Identifier: BSL-1.0 // #ifndef Foundation_SharedMemoryImpl_INCLUDED #define Foundation_SharedMemoryImpl_INCLUDED #include "Poco/Poco.h" #include "Poco/SharedMemory.h" #include "Poco/RefCountedObject.h" namespace Poco { class Foundation_API SharedMemoryImpl: public RefCountedObject /// Shared memory implementation for Windows platforms. { public: SharedMemoryImpl(const std::string& name, std::size_t size, SharedMemory::AccessMode mode, const void* addrHint, bool server); /// Creates or connects to a shared memory object with the given name. /// /// For maximum portability, name should be a valid Unix filename and not /// contain any slashes or backslashes. /// /// An address hint can be passed to the system, specifying the desired /// start address of the shared memory area. Whether the hint /// is actually honored is, however, up to the system. Windows platform /// will generally ignore the hint. SharedMemoryImpl(const Poco::File& file, SharedMemory::AccessMode mode, const void* addrHint); /// Maps the entire contents of file into a shared memory segment. /// /// An address hint can be passed to the system, specifying the desired /// start address of the shared memory area. Whether the hint /// is actually honored is, however, up to the system. Windows platform /// will generally ignore the hint. char* begin() const; /// Returns the begin address of the SharedMemory segment. Will be null for illegal segments. char* end() const; /// Points past the last byte of the end address of the SharedMemory segment. Will be null for illegal segments. protected: void map(); /// Maps the shared memory object. void unmap(); /// Unmaps the shared memory object. void close(); /// Releases the handle for the shared memory segment. ~SharedMemoryImpl(); /// Destroys the SharedMemoryImpl. private: SharedMemoryImpl(); SharedMemoryImpl(const SharedMemoryImpl&); SharedMemoryImpl& operator = (const SharedMemoryImpl&); std::string _name; HANDLE _memHandle; HANDLE _fileHandle; std::size_t _size; DWORD _mode; char* _address; }; // // inlines // inline char* SharedMemoryImpl::begin() const { return _address; } inline char* SharedMemoryImpl::end() const { return _address + _size; } } // namespace Poco #endif // Foundation_SharedMemoryImpl_INCLUDED