# vkCmdSetEvent2(3) Manual Page

## Name

vkCmdSetEvent2 - Set an event object to signaled state

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## C Specification

To signal an event from a device, call:

    // Provided by VK_VERSION_1_3
    void vkCmdSetEvent2(
        VkCommandBuffer                             commandBuffer,
        VkEvent                                     event,
        const VkDependencyInfo*                     pDependencyInfo);

or the equivalent command

    // Provided by VK_KHR_synchronization2
    void vkCmdSetEvent2KHR(
        VkCommandBuffer                             commandBuffer,
        VkEvent                                     event,
        const VkDependencyInfo*                     pDependencyInfo);

## Parameters

- `commandBuffer` is the command buffer into which the command is recorded.

- `event` is the event that will be signaled.

- `pDependencyInfo` is a pointer to a VkDependencyInfo structure defining the first scopes of this operation.

## Description

When vkCmdSetEvent2 is submitted to a queue, it defines the first half of memory dependencies defined by `pDependencyInfo`, as well as an event signal operation which sets the event to the signaled state. A memory dependency is defined between the event signal operation and commands that occur earlier in submission order.

The first synchronization scope and access scope are defined by the union of all the memory dependencies defined by `pDependencyInfo`, and are applied to all operations that occur earlier in submission order. Queue family ownership transfers and image layout transitions defined by `pDependencyInfo` are also included in the first scopes.

The second synchronization scope includes only the event signal operation, and any queue family ownership transfers and image layout transitions defined by `pDependencyInfo`.

The second access scope includes only queue family ownership transfers and image layout transitions.

Future vkCmdWaitEvents2 commands rely on all values of each element in `pDependencyInfo` matching exactly with those used to signal the corresponding event. vkCmdWaitEvents must not be used to wait on the result of a signal operation defined by `vkCmdSetEvent2`.

Note | The extra information provided by vkCmdSetEvent2 compared to vkCmdSetEvent allows implementations to more efficiently schedule the operations required to satisfy the requested dependencies. With vkCmdSetEvent, the full dependency information is not known until vkCmdWaitEvents is recorded, forcing implementations to insert the required operations at that point and not before.

If `event` is already in the signaled state when vkCmdSetEvent2 is executed on the device, then vkCmdSetEvent2 has no effect, no event signal operation occurs, and no dependency is generated.

Valid Usage

- VUID-vkCmdSetEvent2-synchronization2-03824
  The `synchronization2` feature must be enabled

- VUID-vkCmdSetEvent2-dependencyFlags-03825
  The `dependencyFlags` member of `pDependencyInfo` must be `0`

- VUID-vkCmdSetEvent2-srcStageMask-09391
  The `srcStageMask` member of any element of the `pMemoryBarriers`, `pBufferMemoryBarriers`, or `pImageMemoryBarriers` members of `pDependencyInfo` must not include `VK_PIPELINE_STAGE_2_HOST_BIT`

- VUID-vkCmdSetEvent2-dstStageMask-09392
  The `dstStageMask` member of any element of the `pMemoryBarriers`, `pBufferMemoryBarriers`, or `pImageMemoryBarriers` members of `pDependencyInfo` must not include `VK_PIPELINE_STAGE_2_HOST_BIT`

- VUID-vkCmdSetEvent2-commandBuffer-03826
  The current device mask of `commandBuffer` must include exactly one physical device

- VUID-vkCmdSetEvent2-srcStageMask-03827
  The `srcStageMask` member of any element of the `pMemoryBarriers`, `pBufferMemoryBarriers`, or `pImageMemoryBarriers` members of `pDependencyInfo` must only include pipeline stages valid for the queue family that was used to create the command pool that `commandBuffer` was allocated from

- VUID-vkCmdSetEvent2-dstStageMask-03828
  The `dstStageMask` member of any element of the `pMemoryBarriers`, `pBufferMemoryBarriers`, or `pImageMemoryBarriers` members of `pDependencyInfo` must only include pipeline stages valid for the queue family that was used to create the command pool that `commandBuffer` was allocated from

Valid Usage (Implicit)

- VUID-vkCmdSetEvent2-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdSetEvent2-event-parameter
  `event` must be a valid VkEvent handle

- VUID-vkCmdSetEvent2-pDependencyInfo-parameter
  `pDependencyInfo` must be a valid pointer to a valid VkDependencyInfo structure

- VUID-vkCmdSetEvent2-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdSetEvent2-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, or encode operations

- VUID-vkCmdSetEvent2-renderpass
  This command must only be called outside of a render pass instance

- VUID-vkCmdSetEvent2-commonparent
  Both of `commandBuffer`, and `event` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Outside | Both | Graphics Compute Decode Encode | Synchronization

## See Also

VK_KHR_synchronization2, VK_VERSION_1_3, VkCommandBuffer, VkDependencyInfo, VkEvent

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0