Shared Memory and IPC

The Win32 API uses a special case of file mapping to provide shared memory access between processes. If you specify the system swapping file when creating a file-mapping object, the file-mapping object is treated as a shared memory block. Other processes can access the same block of memory by opening the same file-mapping object, as described in File Mapping.

Because shared memory is implemented with file mapping, it supports security access attributes and can operate only between processes running on the same computer.

Key Point Shared memory in the Win32 API is implemented by using file mapping. All characteristics of file mapping apply to shared memory. For more information, see File Mapping.

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