C Specification

To specify additional attributes of NT handles exported from a memory object, add a VkExportMemoryWin32HandleInfoKHR structure to the pNext chain of the VkMemoryAllocateInfo structure. The VkExportMemoryWin32HandleInfoKHR structure is defined as:

// Provided by VK_KHR_external_memory_win32
typedef struct VkExportMemoryWin32HandleInfoKHR {
    VkStructureType               sType;
    const void*                   pNext;
    const SECURITY_ATTRIBUTES*    pAttributes;
    DWORD                         dwAccess;
    LPCWSTR                       name;
} VkExportMemoryWin32HandleInfoKHR;


  • sType is a VkStructureType value identifying this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

  • pAttributes is a pointer to a Windows SECURITY_ATTRIBUTES structure specifying security attributes of the handle.

  • dwAccess is a DWORD specifying access rights of the handle.

  • name is a null-terminated UTF-16 string to associate with the payload referenced by NT handles exported from the created memory.


If VkExportMemoryAllocateInfo is not included in the same pNext chain, this structure is ignored.

If VkExportMemoryAllocateInfo is included in the pNext chain of VkMemoryAllocateInfo with a Windows handleType, but either VkExportMemoryWin32HandleInfoKHR is not included in the pNext chain, or it is included but pAttributes is set to NULL, default security descriptor values will be used, and child processes created by the application will not inherit the handle, as described in the MSDN documentation for “Synchronization Object Security and Access Rights”1. Further, if the structure is not present, the access rights used depend on the handle type.

For handles of the following types:


The implementation must ensure the access rights allow read and write access to the memory.

Valid Usage
  • VUID-VkExportMemoryWin32HandleInfoKHR-handleTypes-00657
    If VkExportMemoryAllocateInfo::handleTypes does not include VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT, a VkExportMemoryWin32HandleInfoKHR structure must not be included in the pNext chain of VkMemoryAllocateInfo

Valid Usage (Implicit)
  • VUID-VkExportMemoryWin32HandleInfoKHR-sType-sType

  • VUID-VkExportMemoryWin32HandleInfoKHR-pAttributes-parameter
    If pAttributes is not NULL, pAttributes must be a valid pointer to a valid SECURITY_ATTRIBUTES value

See Also

Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

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SPDX-License-Identifier: CC-BY-4.0