C Specification

The VkImportSemaphoreFdInfoKHR structure is defined as:

// Provided by VK_KHR_external_semaphore_fd
typedef struct VkImportSemaphoreFdInfoKHR {
    VkStructureType                          sType;
    const void*                              pNext;
    VkSemaphore                              semaphore;
    VkSemaphoreImportFlags                   flags;
    VkExternalSemaphoreHandleTypeFlagBits    handleType;
    int                                      fd;
} VkImportSemaphoreFdInfoKHR;


  • sType is the type of this structure.

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

  • semaphore is the semaphore into which the payload will be imported.

  • flags is a bitmask of VkSemaphoreImportFlagBits specifying additional parameters for the semaphore payload import operation.

  • handleType specifies the type of fd.

  • fd is the external handle to import.


The handle types supported by handleType are:

Table 1. Handle Types Supported by VkImportSemaphoreFdInfoKHR
Handle Type Transference Permanence Supported







Valid Usage
Valid Usage (Implicit)
Host Synchronization
  • Host access to semaphore must be externally synchronized

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.

Copyright (c) 2014-2020 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0