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       clGetCommandQueueInfo - Query information about a command-queue.

       cl_int clGetCommandQueueInfo(cl_command_queue command_queue,
                                    cl_command_queue_info param_name, size_t param_value_size,
                                    void *param_value, size_t *param_value_size_ret);


           Specifies the command-queue being queried.

           Specifies the information to query.

           Specifies the size in bytes of memory pointed to by param_value. This size must be ≥
           size of return type as described in the table below. If param_value is NULL, it is

           A pointer to memory where the appropriate result being queried is returned. If
           param_value is NULL, it is ignored.

           Returns the actual size in bytes of data being queried by param_value. If
           param_value_size_ret is NULL, it is ignored

           The list of supported param_name values and the information returned in param_value by
           clGetCommandQueueInfo is described in the table below.

           │cl_command_queue_infoReturn Type and Information      │
           │                         │ returned in param_value          │
           │CL_QUEUE_CONTEXT         │ Return type: cl_context          │
           │                         │                                  │
           │                         │ Return the context specified     │
           │                         │ when the command-queue is        │
           │                         │ created.                         │
           │CL_QUEUE_DEVICE          │ Return type: cl_device_id        │
           │                         │                                  │
           │                         │ Return the device specified when │
           │                         │ the command-queue is created.    │
           │CL_QUEUE_REFERENCE_COUNT │ Return type: cl_uint             │
           │                         │                                  │
           │                         │ Return the command-queue         │
           │                         │ reference count.                 │
           │                         │                                  │
           │                         │ CL_QUEUE_REFERENCE_COUNT should  │
           │                         │ be considered immediately stale. │
           │                         │ It is unsuitable for general use │
           │                         │ in applications. This feature is │
           │                         │ provided for identifying memory  │
           │                         │ leaks.                           │
           │CL_QUEUE_PROPERTIES      │ Return type:                     │
           │                         │ cl_command_queue_properties      │
           │                         │                                  │
           │                         │ Return the currently specified   │
           │                         │ properties for the               │
           │                         │ command-queue. These properties  │
           │                         │ are specified by the properties  │
           │                         │ argument in                      │
           │                         │ clCreateCommandQueue(3clc).      │


       It is possible that a device(s) becomes unavailable after a context and command-queues
       that use this device(s) have been created and commands have been queued to command-queues.
       In this case the behavior of OpenCL API calls that use this context (and command-queues)
       are considered to be implementation-defined. The user callback function, if specified,
       when the context is created can be used to record appropriate information in the errinfo,
       private_info arguments passed to the callback function when the device becomes


       Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns the

       ·    Returns CL_INVALID_COMMAND_QUEUE if command_queue is not a valid command-queue.

       ·    Returns CL_INVALID_VALUE if param_name is not one of the supported values or if size
           in bytes specified by param_value_size is less than size of return type and
           param_value is not a NULL value.

       ·   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), clReleaseCommandQueue(3clc), clRetainCommandQueue(3clc)


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        1. OpenCL Specification
           page 63, section 5.1 - Command Queues