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       clRetainContext - Increment the context reference count.

       cl_int clRetainContext(cl_context context);


           The context to retain.


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


       Returns CL_SUCCESS if the function is executed successfully. Otherwise, it returns one of
       the following values:

       ·   CL_INVALID_CONTEXT if context is not a valid OpenCL context.

       ·   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]


       clCreateContext(3clc), clCreateContextFromType(3clc), clGetContextInfo(3clc),
       clReleaseContext(3clc), clGetContextInfo(3clc)


       The Khronos Group


       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this
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       without restriction, including without limitation the rights to use, copy, modify, merge,
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       portions of the Materials.


        1. OpenCL Specification
           page 57, section 4.4 - Contexts