---
name: "clRetainEvent"
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/clRetainEvent"
---

# clRetainEvent(3clc)

Increments the event reference count.

## NAME

clRetainEvent - Increments the event reference count.

##

**cl\_int clRetainEvent(cl\_event** *event***);**

## PARAMETERS

*event*

Event object being retained.

## NOTES

The OpenCL commands that return an event perform an implicit retain.

## ERRORS

Returns CL\_SUCCESS if the function executed successfully, or one of the errors below:

• CL\_INVALID\_EVENT if *event* is not a valid event object.

• 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

[**clGetEventInfo**(3clc)](/clGetEventInfo/3clc.md), [**clReleaseEvent**(3clc)](/clReleaseEvent/3clc.md), [**clWaitForEvents**(3clc)](/clWaitForEvents/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 184, section 5.9 - Event Objects