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

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

float atomic_xchg(volatile global(3clc) float *p, float val);

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

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

float atomic_xchg(volatile global(3clc) float *p, float val);

DESCRIPTION

Swaps the old value stored at location p with new value given by val. The function returns old.

A 64-bit version of this function, atom_xchg(3clc), is enabled by cl_khr_int64_base_atomics(3clc).

SPECIFICATION

m[blue]OpenCL Specificationm[][1]

AUTHORS

The Khronos Group

COPYRIGHT

Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated documentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to whom the Materials are furnished to do so, subject to the condition that this copyright notice and permission notice shall be included in all copies or substantial portions of the Materials.

NOTES

1.

OpenCL Specification

page 279, section 6.12.11 - Atomic Functions for 32-bit integers