C Specification
To export a Zircon event handle representing the payload of a semaphore, call:
// Provided by VK_FUCHSIA_external_semaphore
VkResult vkGetSemaphoreZirconHandleFUCHSIA(
VkDevice device,
const VkSemaphoreGetZirconHandleInfoFUCHSIA* pGetZirconHandleInfo,
zx_handle_t* pZirconHandle);
Parameters
-
device
is the logical device that created the semaphore being exported. -
pGetZirconHandleInfo
is a pointer to a VkSemaphoreGetZirconHandleInfoFUCHSIA structure containing parameters of the export operation. -
pZirconHandle
will return the Zircon event handle representing the semaphore payload.
Description
Each call to vkGetSemaphoreZirconHandleFUCHSIA
must create a Zircon
event handle and transfer ownership of it to the application.
To avoid leaking resources, the application must release ownership of the
Zircon event handle when it is no longer needed.
Note
Ownership can be released in many ways. For example, the application can call zx_handle_close() on the file descriptor, or transfer ownership back to Vulkan by using the file descriptor to import a semaphore payload. |
Exporting a Zircon event handle from a semaphore may have side effects depending on the transference of the specified handle type, as described in Importing Semaphore State.
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.