ATOMICFUNCTIONS(3clc)

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💖 ATOMIC FUNCTIONS (3clc) 💖

okay bestie, welcome to the OpenCL Manual page for the atomic functions, and honestly? this one is a whole vibe. it's a lil index page — a table of contents that points you at the real ones — plus some very important tea about 64-bit extensions. let's get into it 🫶

✨ NAME ✨

Atomic_Functions — the atomic functions are shown below. click an item in the table below for details about that function. (yes bestie, it's a clickable situation, we love a directory 💅)

Here's the full roster, no cap:

That's the whole 32-bit crew right there, slaying in a little grid. 🌈

🧚 the 64-bit base extension (cl_khr_int64_base_atomics)

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 this in the OpenCL program source:

#pragma OPENCL EXTENSION cl_khr_int64_base_atomics(3clc) : enable

And these are the extra icons you unlock:

🦋 the 64-bit extended extension (cl_khr_int64_extended_atomics)

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 this in the OpenCL program source:

#pragma OPENCL EXTENSION cl_khr_int64_extended_atomics(3clc) : enable

And the extended-edition girlies are:

💜 DESCRIPTION 💜

okay so here's the actual lore. 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. that's it, that's the one float-friendly function, she's the main character 👑

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.

⚠️ okay important caveat time, listen up: 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. so like, single device = locked in, multiple devices = chaos, don't @ me 😭

📜 SPECIFICATION 📜

OpenCL Specification[2] — that's the receipt, bestie.

👑 AUTHORS 👑

The Khronos Group

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

and that's the whole page, bestie!! you ate that. 🍓

cute lil sign-off: this was the OpenCL Manual page for ATOMIC FUNCTIONS(3clc), brought to you by The Khronos Group, dated 01/14/2021. mwah 💋

📦 where this page comes from