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InterlockedExchangeAdd equivalent

Doug Price
Note: This was originally posted on 11th February 2013 at http://forums.arm.com

I'm porting a Windows application to an ARM® Cortex-A9 based system running Ubuntu 12.04 and I need something equivalent the Windows function InterlockedExchangeAdd().  Is there a function like this available for ARM?  If not, can anyone provide some equivalent assembly code?
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