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atomic_sub - atomic_sub functions. int atomic_sub(volatile global(3clc) int *p, int val); unsigned int atomic_sub(volatile global(3clc) unsigned int *p, unsigned int val); int atomic_sub(volatile local(3clc) int *p, int val); unsigned int atomic_sub(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_sub(3clc), is enabled by cl_khr_int64_base_atomics(3clc).
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1. OpenCL Specification page 279, section 6.12.11 - Atomic Functions for 32-bit integers