To export a POSIX file descriptor representing the payload of a semaphore, call:
// Provided by VK_KHR_external_semaphore_fd VkResult vkGetSemaphoreFdKHR( VkDevice device, const VkSemaphoreGetFdInfoKHR* pGetFdInfo, int* pFd);
deviceis the logical device that created the semaphore being exported.
pGetFdInfois a pointer to a VkSemaphoreGetFdInfoKHR structure containing parameters of the export operation.
pFdwill return the file descriptor representing the semaphore payload.
Each call to
vkGetSemaphoreFdKHR must create a new file descriptor
and transfer ownership of it to the application.
To avoid leaking resources, the application must release ownership of the
file descriptor when it is no longer needed.
Ownership can be released in many ways.
For example, the application can call
Where supported by the operating system, the implementation must set the
file descriptor to be closed automatically when an
execve system call
Exporting a file descriptor from a semaphore may have side effects depending on the transference of the specified handle type, as described in Importing Semaphore State.
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.