79 lines
2.2 KiB
Plaintext
79 lines
2.2 KiB
Plaintext
// Copyright (c) 2016-2017 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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[[VK_KHX_external_semaphore]]
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== VK_KHX_external_semaphore
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*Name String*::
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+VK_KHX_external_semaphore+
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*Extension Type*::
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Device extension
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*Registered Extension Number*::
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78
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*Status*::
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Draft
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*Last Modified Date*::
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2016-10-21
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*Revision*::
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1
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- This extension is written against version 1.0 of the Vulkan API.
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- Requires +VK_KHR_external_semaphore_capabilities+.
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*Contributors*::
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- James Jones, NVIDIA
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- Jeff Juliano, NVIDIA
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*Contact*::
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James Jones (jajones 'at' nvidia.com)
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An application using external memory may wish to synchronize access to that
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memory using semaphores.
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This extension enables an application to create semaphores from which
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non-Vulkan handles that reference the underlying synchronization primitive
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can be exported.
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=== New Object Types
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None.
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=== New Enum Constants
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* ename:VK_STRUCTURE_TYPE_EXPORT_SEMAPHORE_CREATE_INFO_KHX
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* ename:VK_ERROR_INVALID_EXTERNAL_HANDLE_KHX
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=== New Enums
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None.
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=== New Structs
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* slink:VkExportSemaphoreCreateInfoKHX
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=== New Functions
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None.
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=== Issues
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1) Should there be restrictions on what side effects can occur when waiting
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on imported semaphores that are in an invalid state?
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*RESOLVED*: Yes.
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Normally, validating such state would be the responsibility of the
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application, and the implementation would be free to enter an undefined
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state if valid usage rules were violated.
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However, this could cause security concerns when using imported semaphores,
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as it would require the importing application to trust the exporting
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application to ensure the state is valid.
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Requiring this level of trust is undesireable for many potential use cases.
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2) Must implementations validate external handles the application provides
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as input to semaphore state import operations?
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*RESOLVED*: Implementations must return an error to the application if the
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provided semaphore state handle can not be used to complete the requested
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import operation.
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However, implementations need not validate handles are of the exact type
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specified by the application.
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