atomic_cmpxchg - atomic_cmpxchg functions.
int atomic_cmpxchg(volatile global(3clc) int *p, int cmp, int val);
unsigned int atomic_cmpxchg(volatile global(3clc) unsigned int *p, unsigned int cmp, unsigned int val);
int atomic_cmpxchg(volatile local(3clc) int *p, int cmp, int val);
unsigned int atomic_cmpxchg(volatile local(3clc) unsigned int *p, unsigned int cmp, unsigned int val);
Read the 32-bit value (referred to as old) stored at location pointed by p. Compute (old == cmp) ? val : old and store result at location pointed by p. The function returns old.
A 64-bit version of this function, atom_cmpxchg(3clc), is enabled by cl_khr_int64_base_atomics(3clc).
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- OpenCL Specification
|01/14/2021||The Khronos Group|