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       clCreateUserEvent - Creates a user event object.

       cl_event clCreateUserEvent(cl_context context, cl_int *errcode_ret);


           A valid OpenCL context used to create the user event object.

           Returns an appropriate error code. If errcode_ret is NULL, no error code is returned.


       User events allow applications to enqueue commands that wait on a user event to finish
       before the command is executed by the device.

       The execution status of the user event object created is set to CL_SUBMITTED.


       Returns a valid non-zero buffer object and errcode_ret is set to CL_SUCCESS if the user
       event object is created successfully. Otherwise, it returns a NULL value with one of the
       following error values returned in errcode_ret:

       ·   CL_INVALID_CONTEXT if context is not a valid 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]




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        1. OpenCL Specification
           page 178, section 5.9 - Event Objects