# vkCreateEvent(3) Manual Page

## Name

vkCreateEvent - Create a new event object

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## C Specification

To create an event, call:

    // Provided by VK_VERSION_1_0
    VkResult vkCreateEvent(
        VkDevice                                    device,
        const VkEventCreateInfo*                    pCreateInfo,
        const VkAllocationCallbacks*                pAllocator,
        VkEvent*                                    pEvent);

## Parameters

- `device` is the logical device that creates the event.

- `pCreateInfo` is a pointer to a VkEventCreateInfo structure containing information about how the event is to be created.

- `pAllocator` controls host memory allocation as described in the Memory Allocation chapter.

- `pEvent` is a pointer to a handle in which the resulting event object is returned.

## Description

When created, the event object is in the unsignaled state.

Valid Usage

- VUID-vkCreateEvent-device-09672
  `device` must support at least one queue family with one of the `VK_QUEUE_VIDEO_ENCODE_BIT_KHR`, `VK_QUEUE_VIDEO_DECODE_BIT_KHR`, `VK_QUEUE_COMPUTE_BIT`, or `VK_QUEUE_GRAPHICS_BIT` capabilities

- VUID-vkCreateEvent-events-04468
  If the `VK_KHR_portability_subset` extension is enabled, and VkPhysicalDevicePortabilitySubsetFeaturesKHR::`events` is `VK_FALSE`, then the implementation does not support events, and vkCreateEvent must not be used

Valid Usage (Implicit)

- VUID-vkCreateEvent-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkCreateEvent-pCreateInfo-parameter
  `pCreateInfo` must be a valid pointer to a valid VkEventCreateInfo structure

- VUID-vkCreateEvent-pAllocator-parameter
  If `pAllocator` is not `NULL`, `pAllocator` must be a valid pointer to a valid VkAllocationCallbacks structure

- VUID-vkCreateEvent-pEvent-parameter
  `pEvent` must be a valid pointer to a VkEvent handle

- VUID-vkCreateEvent-device-queuecount
  The device must have been created with at least `1` queue

Return Codes

On success, this command returns

  - `VK_SUCCESS`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

## See Also

VK_VERSION_1_0, VkAllocationCallbacks, VkDevice, VkEvent, VkEventCreateInfo

## 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.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0