| // Copyright (c) 2016-2018 Khronos Group. This work is licensed under a |
| // Creative Commons Attribution 4.0 International License; see |
| // http://creativecommons.org/licenses/by/4.0/ |
| |
| include::meta/VK_KHR_external_semaphore_fd.txt[] |
| |
| *Last Modified Date*:: |
| 2016-10-21 |
| *IP Status*:: |
| No known IP claims. |
| *Contributors*:: |
| - Jesse Hall, Google |
| - James Jones, NVIDIA |
| - Jeff Juliano, NVIDIA |
| - Carsten Rohde, NVIDIA |
| |
| An application using external memory may wish to synchronize access to that |
| memory using semaphores. |
| This extension enables an application to export semaphore payload to and |
| import semaphore payload from POSIX file descriptors. |
| |
| === New Object Types |
| |
| None. |
| |
| === New Enum Constants |
| |
| * ename:VK_STRUCTURE_TYPE_IMPORT_SEMAPHORE_FD_INFO_KHR |
| * ename:VK_STRUCTURE_TYPE_SEMAPHORE_GET_FD_INFO_KHR |
| |
| === New Enums |
| |
| None. |
| |
| === New Structs |
| |
| * slink:VkImportSemaphoreFdInfoKHR |
| * slink:VkSemaphoreGetFdInfoKHR |
| |
| === New Functions |
| |
| * flink:vkImportSemaphoreFdKHR |
| * flink:vkGetSemaphoreFdKHR |
| |
| === Issues |
| |
| 1) Does the application need to close the file descriptor returned by |
| flink:vkGetSemaphoreFdKHR? |
| |
| *RESOLVED*: Yes, unless it is passed back in to a driver instance to import |
| the semaphore. |
| A successful get call transfers ownership of the file descriptor to the |
| application, and a successful import transfers it back to the driver. |
| Destroying the original semaphore object will not close the file descriptor |
| or remove its reference to the underlying semaphore resource associated with |
| it. |
