Provided by: opencl-1.2-man-doc_1.0~svn22836-1.1_all
get_global_id - Returns the unique global work-item ID value for dimension identified by dimindx. size_t get_global_id(uint dimindx);
The global work-item ID specifies the work-item ID based on the number of global work-items specified to execute the kernel. Valid values of dimindx are 0 to get_work_dim(3clc)() - 1. For other values of dimindx, get_global_id() returns 0. For clEnqueueTask(3clc), this returns 0.
workItemFunctions(3clc), clEnqueueNDRangeKernel(3clc), clEnqueueTask(3clc)
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1. OpenCL Specification page 242, section 6.12.1 - Work-Item Functions