clRetainCommandQueue(3) Increments the command_queue reference count.

cl_int clRetainCommandQueue(cl_command_queue command_queue);



Specifies the command-queue to retain.


clCreateCommandQueue(3clc) performs an implicit retain. This is very helpful for 3rd party libraries, which typically get a command-queue passed to them by the application. However, it is possible that the application may delete the command-queue without informing the library. Allowing functions to attach to (i.e. retain) and release a command-queue solves the problem of a command-queue being used by a library no longer being valid.


Returns CL_SUCCESS if the function executed successfully, or one of the errors below:

• CL_INVALID_COMMAND_QUEUE if command_queue is not a valid command-queue.

• 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.


m[blue]OpenCL Specificationm[][1]


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OpenCL Specification
page 62, section 5.1 - Command Queues