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       atomic_add - atomic_add functions.

       int atomic_add(volatile global(3clc) int *p, int val);

       unsigned int atomic_add(volatile global(3clc) unsigned int *p, unsigned int val);

       int atomic_add(volatile local(3clc) int *p, int val);

       unsigned int atomic_add(volatile local(3clc) unsigned int *p, unsigned int val);


       Read the 32-bit value (referred to as old) stored at location pointed by p. Compute (old +
       val) and store result at location pointed by p. The function returns old.

       A 64-bit version of this function, atom_add(3clc), is enabled by


       OpenCL Specification[1]


       atomicFunctions(3clc), atom_add(3clc)


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        1. OpenCL Specification
           page 279, section 6.12.11 - Atomic Functions for 32-bit integers