---
name: "clCreateUserEvent"
section: "3clc"
platform: "linux"
package: "opencl-1.2-man-doc"
version: "1.0~svn33624-5.1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/clCreateUserEvent"
---

# clCreateUserEvent(3clc)

Creates a user event object.

## NAME

clCreateUserEvent - Creates a user event object.

##

**cl\_event clCreateUserEvent(cl\_context** *context***, cl\_int \****errcode\_ret***);**

## PARAMETERS

*context*

A valid OpenCL context used to create the user event object.

*errcode\_ret*

Returns an appropriate error code. If *errcode\_ret* is NULL, no error code is returned.

## NOTES

User events allow applications to enqueue commands that wait on a user event to finish before the command is executed by the device.

The execution status of the user event object created is set to **CL\_SUBMITTED**.

## ERRORS

Returns a valid non-zero buffer object and *errcode\_ret* is set to CL\_SUCCESS if the user event object is created successfully. Otherwise, it returns a NULL value with one of the following error values returned in *errcode\_ret*:

• CL\_INVALID\_CONTEXT if *context* is not a valid context.

• CL\_OUT\_OF\_RESOURCES if there is a failure to allocate resources required by the OpenCL implementation on the device.

• CL\_OUT\_OF\_HOST\_MEMORY if there is a failure to allocate resources required by the OpenCL implementation on the host.

## SPECIFICATION

**OpenCL Specification**\[1\]

## SEE ALSO

[**classDiagram**(3clc)](/classDiagram/3clc.md)

## AUTHORS

**The Khronos Group**

## COPYRIGHT

Copyright © 2007-2011 The Khronos Group Inc.\
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.

## NOTES

- 1\.

  OpenCL Specification

  page 178, section 5.9 - Event Objects