NAME¶
Atomic_Functions - The atomic functions are shown below. Click an item in the
table below for details about that function.
atomic_add(3clc) |
atomic_sub(3clc) |
atomic_xchg(3clc) |
atomic_inc(3clc) |
atomic_dec(3clc) |
atomic_cmpxchg(3clc) |
atomic_min(3clc) |
atomic_max(3clc) |
atomic_and(3clc) |
atomic_or(3clc) |
atomic_xor(3clc) |
|
The
cl_khr_int64_base_atomics(3clc) extension enables additional atomic
functions using types
long and
unsigned long. An application
that wants to use this extension will need to include the #pragma OPENCL
EXTENSION
cl_khr_int64_base_atomics(3clc) : enable in the OpenCL
program source.
atom_add(3clc) |
atom_sub(3clc) |
atom_xchg(3clc) |
atom_inc(3clc) |
atom_dec(3clc) |
atom_cmpxchg(3clc) |
|
|
The
cl_khr_int64_extended_atomics(3clc) extension enables additional
atomic functions using types
long and
unsigned long. An
application that wants to use this extension will need to include the #pragma
OPENCL EXTENSION
cl_khr_int64_extended_atomics(3clc) : enable in the
OpenCL program source.
atom_min(3clc) |
atom_max(3clc) |
atom_xor(3clc) |
atom_and(3clc) |
atom_or(3clc) |
|
DESCRIPTION¶
These functions provide atomic operations on 32-bit signed, unsigned integers
and single precision floating-point to locations in
global(3clc) or
local(3clc) memory. Only the
atomic_xchg operation is supported
for single precision floating-point data type.
The atomic built-in functions that use the
atom_ prefix and are described
in the
OpenCL Extension Specification[1] and are enabled by:
cl_khr_global_int32_base_atomics, cl_khr_global_int32_extended_atomics,
cl_khr_local_int32_base_atomics, and cl_khr_local_int32_extended_atomics in
sections 9.5 and 9.6 of the OpenCL 1.0 specification are also supported. .
The 64-bit transactions are atomic for the device executing these atomic
functions. There is no guarantee of atomicity if the atomic operations to the
same memory location are being performed by kernels executing on multiple
devices.
SPECIFICATION¶
OpenCL Specification[2]
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 Extension Specification
page 10, section 9.3 - 64-bit Atomics
- 2.
- OpenCL Specification
page 279, section 6.12.11 - Atomic Functions for 32-bit
integers