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