C Specification

To release a device, call the function:

cl_int clReleaseDevice(
    cl_device_id device);

Parameters

  • device is the OpenCL device to retain.

Description

clReleaseDevice decrements 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.

clReleaseDevice returns CL_​SUCCESS if the function is executed successfully. 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.

After the device reference count becomes zero and all the objects attached to device (such as command-queues) are released, the device object is deleted. Using this function to release a reference that was not obtained by creating the object or by calling clRetainDevice causes undefined behavior.

See Also

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