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# docs.GL

GLSL 4
GLSL ES 3

# atomicMin

## Name

atomicMin — perform an atomic min operation to a variable

## Declaration

`int atomicMin(` | inout int mem,
| int data`)`;

`uint atomicMin(` | inout uint mem,
| uint data`)`;

## Parameters

`mem`

  The variable to use as the target of the operation.

`data`

  The data to be compared to `mem`.

## Description

`atomicMin` performs an atomic comparison of `data` to the contents of `mem`, writes the minimum value into `mem` and returns the original contents of `mem` from before the comparison occured. The contents of the memory being updated by the atomic operation are guaranteed not to be modified by any other assignment or atomic memory function in any shader invocation between the time the original value is read and the time the new value is written.

Atomic memory functions are supported only for a limited set of variables. A shader will fail to compile if the value passed to the mem argument of an atomic memory function does not correspond to a buffer or shared variable. It is acceptable to pass an element of an array or a single component of a vector to the mem argument of an atomic memory function, as long as the underlying array or vector is a buffer or shared variable.

## Version Support

| OpenGL Shading Language Version
--- | ---
Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50
atomicMin | - | - | - | - | - | - | - | - | - | ✔ | ✔ | ✔

## See Also

atomicAdd, atomicAnd, atomicOr, atomicXor, atomicMax, atomicExchange, atomicCompSwap

## Copyright

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.

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