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InterlockedExchangeAdd equivalent

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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Alban Rampon over 12 years ago

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

Hello DKP and welcome,
I believe this function is to do atomic add.

Here is an example of code for atomic increment you might be interested in from an old thread here.
There are also a number of external blogs discussing about this.
For instance Jon Masters has an example of atomic add halway through the page.

Please when you see the code examples, keep in mind you are using an ARMv7 architecture (and not ARMv6 some examples can be for).

Cheers,
Alban
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Alban Rampon over 12 years ago

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

Hello DKP and welcome,
I believe this function is to do atomic add.

Here is an example of code for atomic increment you might be interested in from an old thread here.
There are also a number of external blogs discussing about this.
For instance Jon Masters has an example of atomic add halway through the page.

Please when you see the code examples, keep in mind you are using an ARMv7 architecture (and not ARMv6 some examples can be for).

Cheers,
Alban
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