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       clRetainCommandQueue - 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.


       OpenCL Specification[1]


       clCreateCommandQueue(3clc), clGetCommandQueueInfo(3clc), clReleaseCommandQueue(3clc)


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        1. OpenCL Specification
           page 62, section 5.1 - Command Queues