Extension and Version Dependencies
VK_KHR_external_semaphore
or
Version 1.1
Contact
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James Jones cubanismo
Other Extension Metadata
- Last Modified Date
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2016-10-21
- IP Status
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No known IP claims.
- Contributors
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Jesse Hall, Google
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James Jones, NVIDIA
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Jeff Juliano, NVIDIA
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Carsten Rohde, NVIDIA
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Description
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 Enum Constants
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VK_KHR_EXTERNAL_SEMAPHORE_FD_EXTENSION_NAME -
VK_KHR_EXTERNAL_SEMAPHORE_FD_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_IMPORT_SEMAPHORE_FD_INFO_KHR -
VK_STRUCTURE_TYPE_SEMAPHORE_GET_FD_INFO_KHR
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Issues
1) Does the application need to close the file descriptor returned by 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.
Document Notes
For more information, see the Vulkan Specification
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