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atomicExchange — perform an atomic exchange operation to a variable


int atomicExchange( inout int mem,
  int data);
uint atomicExchange( inout uint mem,
  uint data);



The variable to use as the target of the operation.


The data to be exchanged with mem.


atomicExchange performs an atomic exhange of data with the contents of mem. The content of data is written into mem and the original contents of mem are returned. 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 ES Shading Language Version
Function Name 1.00 3.00 3.10
atomicExchange - -
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