# vkResetQueryPool(3) Manual Page

## Name

vkResetQueryPool - Reset queries in a query pool

## C Specification

To reset a range of queries in a query pool on the host, call:

    void vkResetQueryPool(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount);

or the equivalent command

    void vkResetQueryPoolEXT(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount);

## Parameters

- `device` is the logical device that owns the query pool.

- `queryPool` is the handle of the query pool managing the queries being reset.

- `firstQuery` is the initial query index to reset.

- `queryCount` is the number of queries to reset.

## Description

This command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable.

If `queryPool` is `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` this command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable for each pass.

Valid Usage

- The hostQueryReset feature must be enabled

- `firstQuery` must be less than the number of queries in `queryPool`

- The sum of `firstQuery` and `queryCount` must be less than or equal to the number of queries in `queryPool`

- Submitted commands that refer to the range specified by `firstQuery` and `queryCount` in `queryPool` must have completed execution

- The range of queries specified by `firstQuery` and `queryCount` in `queryPool` must not be in use by calls to vkGetQueryPoolResults or `vkResetQueryPool` in other threads

Valid Usage (Implicit)

- `device` must be a valid VkDevice handle

- `queryPool` must be a valid VkQueryPool handle

- `queryPool` must have been created, allocated, or retrieved from `device`

## See Also

VkDevice, VkQueryPool

## 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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.