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Examplesįor a code example, see Scenario 1 in VirtualAlloc2.Ps1 games are a blast from the past, but you can still enjoy them on your pc. And allocating memory with specific alignment for example, to enable your application to commit large/huge page-mapped regions on demand. For example, mapping memory on top of a previously reserved region this is useful for implementing an automatically wrapping ring buffer. This API helps support high-performance games, and server applications, which have particular requirements around managing their virtual address space. Otherwise, returns NULL and extended error status is available Returns the base address of the mapped view, if successful. The number of extended parameters pointed to by ExtendedParameters. If no MemExtendedParameterNumaNode extended parameter is provided, then the behavior is the same as for the VirtualAlloc/ MapViewOfFile functions (that is, the preferred NUMA node for the physical pages is determined based on the ideal processor of the thread that first accesses the memory). Each of those extended parameter values can itself have a Type field of either MemExtendedParameterAddressRequirements or MemExtendedParameterNumaNode. PageProtection parameter has no effect, and should be set to any valid value such asĪn optional pointer to one or more extended parameters of type MEM_EXTENDED_PARAMETER. If you provide a non-null value for the BaseAddress parameter, then the value must be a multiple of GetLargePageMinimum.įor file-mapping objects created with the SEC_IMAGE attribute, the The size of the view must be a multiple of the size of a large page reported by the GetLargePageMinimum function, and the file-mapping object must have been created using the SEC_LARGE_PAGES option. This flag specifies that the view should be mapped using large page support. The 64k alignment requirements on Offset and BaseAddress do not apply when this flag is specified.
When you replace a placeholder, BaseAddress and ViewSize must exactly match those of the placeholder.Īfter you replace a placeholder with a mapped view, to free that mapped view back to a placeholder, see the UnmapFlags parameter of UnmapViewOfFileEx and UnmapViewOfFile2.Ī placeholder is a type of reserved memory region. Only data/pf-backed section views are supported (no images, physical memory, etc.).
Replaces a placeholder with a mapped view. This parameter can be zero (0) or one of the following values.
The size must always be a multiple of the page size. Specifies that the entire section is to be mapped. The offset from the beginning of the section. If this parameter is NULL, the system picks the base The address is rounded down to the nearest 64k boundary. Into the address space of the specified process.Ī HANDLE to a process into which the section MEM_EXTENDED_PARAMETER *ExtendedParameters,Ī HANDLE to a section that is to be mapped To specify the NUMA node, see the ExtendedParameters parameter.
Using this function, you can: for new allocations, specify a range of virtual address space and a power-of-2 alignment restriction specify an arbitrary number of extended parameters specify a preferred NUMA node for the physical memory as an extended parameter and specify a placeholder operation (specifically, replacement).
Maps a view of a file or a pagefile-backed section into the address