Cuda atomic swap

int atomicCAS(int* address, int compare, int val);
//reads the 16-bit, 32-bit or 64-bit word old located at the address 
//address in global or shared memory, computes 
//(old == compare ? val : old) , and stores the result back to memory 
//at the same address. These three operations are performed in one 
//atomic transaction. The function returns old (Compare And Swap).

Source: docs.nvidia.com

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