C Specification

To retain a device, call the function:

// Provided by CL_VERSION_1_2
cl_int clRetainDevice(
    cl_device_id device);
clRetainDevice is missing before version 1.2.

Parameters

  • device is the OpenCL device to retain.

Description

clRetainDevice increments the device reference count if device is a valid sub-device created by a call to clCreateSubDevices. If device is a root level device i.e. a cl_device_id returned by clGetDeviceIDs, the device reference count remains unchanged.

clRetainDevice returns CL_SUCCESS if the function is executed successfully or the device is a root-level device. Otherwise, it returns one of the following errors:

  • CL_INVALID_DEVICE

    • if device is not a valid device

  • 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

See Also

CL_VERSION_1_2, clReleaseDevice, cl_device_id

Document Notes

For more information, see the OpenCL Specification

This page is extracted from the OpenCL Specification. Fixes and changes should be made to the Specification, not directly.

Copyright

Copyright 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0