C Specification

To specify additional attributes of NT handles exported from a semaphore, add the VkExportSemaphoreWin32HandleInfoKHR structure to the pNext chain of the VkSemaphoreCreateInfo structure. The VkExportSemaphoreWin32HandleInfoKHR structure is defined as:

typedef struct VkExportSemaphoreWin32HandleInfoKHR {
    VkStructureType               sType;
    const void*                   pNext;
    const SECURITY_ATTRIBUTES*    pAttributes;
    DWORD                         dwAccess;
    LPCWSTR                       name;
} VkExportSemaphoreWin32HandleInfoKHR;

Members

  • sType is the type of this structure.

  • pNext is NULL or a pointer to an extension-specific 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 underlying synchronization primitive referenced by NT handles exported from the created semaphore.

Description

If this structure is not present, or if 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 will be

DXGI_SHARED_RESOURCE_READ | DXGI_SHARED_RESOURCE_WRITE

for handles of the following types:

VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_BIT

And

GENERIC_ALL

for handles of the following types:

VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE_BIT

1

https://msdn.microsoft.com/en-us/library/windows/desktop/ms686670.aspx

Valid Usage

  • If VkExportSemaphoreCreateInfo::handleTypes does not include VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_BIT or VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_D3D12_FENCE_BIT, VkExportSemaphoreWin32HandleInfoKHR must not be in the pNext chain of VkSemaphoreCreateInfo.

Valid Usage (Implicit)

  • sType must be VK_STRUCTURE_TYPE_EXPORT_SEMAPHORE_WIN32_HANDLE_INFO_KHR

  • If pAttributes is not NULL, pAttributes must be a valid pointer to a valid SECURITY_ATTRIBUTES value

See Also

VkStructureType

Document Notes

For more information, see the Vulkan Specification at URL

https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VkExportSemaphoreWin32HandleInfoKHR

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

Copyright

Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.